458 lines
12 KiB
C
458 lines
12 KiB
C
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/* $OpenBSD: verify.c,v 1.17 2023/04/14 15:27:13 tb Exp $ */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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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 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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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 "apps.h"
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#include <openssl/bio.h>
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#include <openssl/err.h>
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#include <openssl/pem.h>
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#include <openssl/x509.h>
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#include <openssl/x509v3.h>
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static int cb(int ok, X509_STORE_CTX *ctx);
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static int check(X509_STORE *ctx, char *file, STACK_OF(X509) *uchain,
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STACK_OF(X509) *tchain, STACK_OF(X509_CRL) *crls);
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static int vflags = 0;
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static struct {
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char *CAfile;
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char *CApath;
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char *crlfile;
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char *trustfile;
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char *untfile;
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int verbose;
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X509_VERIFY_PARAM *vpm;
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} cfg;
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static int
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verify_opt_args(int argc, char **argv, int *argsused)
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{
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int oargc = argc;
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int badarg = 0;
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if (!args_verify(&argv, &argc, &badarg, bio_err, &cfg.vpm))
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return (1);
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if (badarg)
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return (1);
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*argsused = oargc - argc;
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return (0);
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}
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static const struct option verify_options[] = {
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{
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.name = "CAfile",
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.argname = "file",
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.desc = "Certificate Authority file",
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.type = OPTION_ARG,
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.opt.arg = &cfg.CAfile,
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},
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{
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.name = "CApath",
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.argname = "path",
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.desc = "Certificate Authority path",
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.type = OPTION_ARG,
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.opt.arg = &cfg.CApath,
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},
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{
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.name = "CRLfile",
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.argname = "file",
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.desc = "Certificate Revocation List file",
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.type = OPTION_ARG,
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.opt.arg = &cfg.crlfile,
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},
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{
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.name = "trusted",
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.argname = "file",
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.desc = "Trusted certificates file",
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.type = OPTION_ARG,
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.opt.arg = &cfg.trustfile,
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},
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{
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.name = "untrusted",
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.argname = "file",
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.desc = "Untrusted certificates file",
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.type = OPTION_ARG,
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.opt.arg = &cfg.untfile,
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},
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{
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.name = "verbose",
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.desc = "Verbose",
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.type = OPTION_FLAG,
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.opt.flag = &cfg.verbose,
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},
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{
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.name = NULL,
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.desc = "",
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.type = OPTION_ARGV_FUNC,
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.opt.argvfunc = verify_opt_args,
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},
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{ NULL },
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};
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static const struct option verify_shared_options[] = {
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{
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.name = "attime",
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.argname = "epoch",
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.desc = "Use epoch as the verification time",
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},
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{
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.name = "check_ss_sig",
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.desc = "Check the root CA self-signed certificate signature",
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},
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{
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.name = "crl_check",
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.desc = "Enable CRL checking for the leaf certificate",
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},
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{
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.name = "crl_check_all",
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.desc = "Enable CRL checking for the entire certificate chain",
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},
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{
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.name = "explicit_policy",
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.desc = "Require explicit policy (per RFC 3280)",
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},
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{
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.name = "extended_crl",
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.desc = "Enable extended CRL support",
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},
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{
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.name = "ignore_critical",
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.desc = "Disable critical extension checking",
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},
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{
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.name = "inhibit_any",
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.desc = "Inhibit any policy (per RFC 3280)",
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},
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{
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.name = "inhibit_map",
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.desc = "Inhibit policy mapping (per RFC 3280)",
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},
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{
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.name = "issuer_checks",
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.desc = "Enable debugging of certificate issuer checks",
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},
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{
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.name = "legacy_verify",
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.desc = "Use legacy certificate chain verification",
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},
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{
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.name = "policy",
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.argname = "name",
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.desc = "Add given policy to the acceptable set",
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},
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{
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.name = "policy_check",
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.desc = "Enable certificate policy checking",
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},
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{
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.name = "policy_print",
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.desc = "Print policy",
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},
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{
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.name = "purpose",
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.argname = "name",
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.desc = "Verify for the given purpose",
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},
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{
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.name = "use_deltas",
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.desc = "Use delta CRLS (if present)",
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},
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{
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.name = "verify_depth",
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.argname = "num",
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.desc = "Limit verification to the given depth",
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},
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{
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.name = "x509_strict",
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.desc = "Use strict X.509 rules (disables workarounds)",
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},
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{ NULL },
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};
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static void
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verify_usage(void)
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{
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int i;
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fprintf(stderr,
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"usage: verify [-CAfile file] [-CApath directory] [-check_ss_sig]\n"
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" [-CRLfile file] [-crl_check] [-crl_check_all]\n"
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" [-explicit_policy] [-extended_crl]\n"
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" [-ignore_critical] [-inhibit_any] [-inhibit_map]\n"
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" [-issuer_checks] [-policy_check] [-purpose purpose]\n"
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" [-trusted file] [-untrusted file] [-verbose]\n"
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" [-x509_strict] [certificates]\n\n");
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options_usage(verify_options);
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fprintf(stderr, "\nVerification options:\n\n");
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options_usage(verify_shared_options);
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fprintf(stderr, "\nValid purposes:\n\n");
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for (i = 0; i < X509_PURPOSE_get_count(); i++) {
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X509_PURPOSE *ptmp = X509_PURPOSE_get0(i);
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fprintf(stderr, " %-18s%s\n", X509_PURPOSE_get0_sname(ptmp),
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X509_PURPOSE_get0_name(ptmp));
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}
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}
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int
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verify_main(int argc, char **argv)
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{
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STACK_OF(X509) *untrusted = NULL, *trusted = NULL;
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STACK_OF(X509_CRL) *crls = NULL;
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X509_STORE *cert_ctx = NULL;
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X509_LOOKUP *lookup = NULL;
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char **cert_files = NULL;
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int argsused;
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int ret = 1;
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if (pledge("stdio rpath", NULL) == -1) {
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perror("pledge");
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exit(1);
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}
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memset(&cfg, 0, sizeof(cfg));
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if (options_parse(argc, argv, verify_options, NULL, &argsused) != 0) {
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verify_usage();
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goto end;
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}
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if (argsused < argc)
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cert_files = &argv[argsused];
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cert_ctx = X509_STORE_new();
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if (cert_ctx == NULL)
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goto end;
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X509_STORE_set_verify_cb(cert_ctx, cb);
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if (cfg.vpm)
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X509_STORE_set1_param(cert_ctx, cfg.vpm);
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lookup = X509_STORE_add_lookup(cert_ctx, X509_LOOKUP_file());
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if (lookup == NULL)
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abort(); /* XXX */
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if (cfg.CAfile) {
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if (!X509_LOOKUP_load_file(lookup, cfg.CAfile,
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X509_FILETYPE_PEM)) {
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BIO_printf(bio_err, "Error loading file %s\n",
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cfg.CAfile);
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ERR_print_errors(bio_err);
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goto end;
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}
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} else
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X509_LOOKUP_load_file(lookup, NULL, X509_FILETYPE_DEFAULT);
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lookup = X509_STORE_add_lookup(cert_ctx, X509_LOOKUP_hash_dir());
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if (lookup == NULL)
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abort(); /* XXX */
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if (cfg.CApath) {
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if (!X509_LOOKUP_add_dir(lookup, cfg.CApath,
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X509_FILETYPE_PEM)) {
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BIO_printf(bio_err, "Error loading directory %s\n",
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cfg.CApath);
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ERR_print_errors(bio_err);
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goto end;
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}
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} else
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X509_LOOKUP_add_dir(lookup, NULL, X509_FILETYPE_DEFAULT);
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ERR_clear_error();
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if (cfg.untfile) {
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untrusted = load_certs(bio_err, cfg.untfile,
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FORMAT_PEM, NULL, "untrusted certificates");
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if (!untrusted)
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goto end;
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}
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if (cfg.trustfile) {
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trusted = load_certs(bio_err, cfg.trustfile,
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FORMAT_PEM, NULL, "trusted certificates");
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if (!trusted)
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goto end;
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}
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if (cfg.crlfile) {
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crls = load_crls(bio_err, cfg.crlfile, FORMAT_PEM,
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NULL, "other CRLs");
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if (!crls)
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goto end;
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}
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ret = 0;
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if (cert_files == NULL) {
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if (1 != check(cert_ctx, NULL, untrusted, trusted, crls))
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ret = -1;
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} else {
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do {
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if (1 != check(cert_ctx, *cert_files++, untrusted,
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trusted, crls))
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ret = -1;
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} while (*cert_files != NULL);
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}
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end:
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if (cfg.vpm)
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X509_VERIFY_PARAM_free(cfg.vpm);
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if (cert_ctx != NULL)
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X509_STORE_free(cert_ctx);
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sk_X509_pop_free(untrusted, X509_free);
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sk_X509_pop_free(trusted, X509_free);
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sk_X509_CRL_pop_free(crls, X509_CRL_free);
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return (ret < 0 ? 2 : ret);
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}
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static int
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check(X509_STORE *ctx, char *file, STACK_OF(X509) *uchain,
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STACK_OF(X509) *tchain, STACK_OF(X509_CRL) *crls)
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{
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X509 *x = NULL;
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X509_STORE_CTX *csc = NULL;
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const char *certfile = (file == NULL) ? "stdin" : file;
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int verify_err;
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int i = 0, ret = 0;
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x = load_cert(bio_err, file, FORMAT_PEM, NULL, "certificate file");
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if (x == NULL)
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goto end;
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if ((csc = X509_STORE_CTX_new()) == NULL)
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goto end;
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X509_STORE_set_flags(ctx, vflags);
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if (!X509_STORE_CTX_init(csc, ctx, x, uchain))
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goto end;
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if (tchain)
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X509_STORE_CTX_trusted_stack(csc, tchain);
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if (crls)
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X509_STORE_CTX_set0_crls(csc, crls);
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i = X509_verify_cert(csc);
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verify_err = X509_STORE_CTX_get_error(csc);
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if (i > 0 && verify_err == X509_V_OK) {
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fprintf(stdout, "%s: OK\n", certfile);
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ret = 1;
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} else {
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fprintf(stdout, "%s: verification failed: %d (%s)\n", certfile,
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verify_err, X509_verify_cert_error_string(verify_err));
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}
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end:
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if (i <= 0)
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ERR_print_errors(bio_err);
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X509_free(x);
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X509_STORE_CTX_free(csc);
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return (ret);
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}
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static int
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cb(int ok, X509_STORE_CTX *ctx)
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{
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int cert_error = X509_STORE_CTX_get_error(ctx);
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X509 *current_cert = X509_STORE_CTX_get_current_cert(ctx);
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if (!ok) {
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if (current_cert) {
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X509_NAME_print_ex_fp(stdout,
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X509_get_subject_name(current_cert),
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0, XN_FLAG_ONELINE);
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printf("\n");
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}
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printf("%serror %d at %d depth lookup:%s\n",
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X509_STORE_CTX_get0_parent_ctx(ctx) ? "[CRL path]" : "",
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cert_error,
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X509_STORE_CTX_get_error_depth(ctx),
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X509_verify_cert_error_string(cert_error));
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switch (cert_error) {
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case X509_V_ERR_NO_EXPLICIT_POLICY:
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||
|
case X509_V_ERR_CERT_HAS_EXPIRED:
|
||
|
|
||
|
/*
|
||
|
* since we are just checking the certificates, it is
|
||
|
* ok if they are self signed. But we should still
|
||
|
* warn the user.
|
||
|
*/
|
||
|
|
||
|
case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
|
||
|
/* Continue after extension errors too */
|
||
|
case X509_V_ERR_INVALID_CA:
|
||
|
case X509_V_ERR_INVALID_NON_CA:
|
||
|
case X509_V_ERR_PATH_LENGTH_EXCEEDED:
|
||
|
case X509_V_ERR_INVALID_PURPOSE:
|
||
|
case X509_V_ERR_CRL_HAS_EXPIRED:
|
||
|
case X509_V_ERR_CRL_NOT_YET_VALID:
|
||
|
case X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION:
|
||
|
ok = 1;
|
||
|
|
||
|
}
|
||
|
|
||
|
return ok;
|
||
|
|
||
|
}
|
||
|
if (!cfg.verbose)
|
||
|
ERR_clear_error();
|
||
|
return (ok);
|
||
|
}
|