/* $OpenBSD: crl.c,v 1.17 2023/03/06 14:32:05 tb Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "apps.h"

#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/pem.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>

static struct {
        char *cafile;
        char *capath;
        int crlnumber;
        int fingerprint;
        int hash;
        int hash_old;
        char *infile;
        int informat;
        int issuer;
        int lastupdate;
        char *nameopt;
        int nextupdate;
        int noout;
        char *outfile;
        int outformat;
        int text;
        int verify;
} cfg;

static const struct option crl_options[] = {
        {
                .name = "CAfile",
                .argname = "file",
                .desc = "Verify the CRL using certificates in the given file",
                .type = OPTION_ARG,
                .opt.arg = &cfg.cafile,
        },
        {
                .name = "CApath",
                .argname = "path",
                .desc = "Verify the CRL using certificates in the given path",
                .type = OPTION_ARG,
                .opt.arg = &cfg.capath,
        },
        {
                .name = "crlnumber",
                .desc = "Print the CRL number",
                .type = OPTION_FLAG_ORD,
                .opt.flag = &cfg.crlnumber,
        },
        {
                .name = "fingerprint",
                .desc = "Print the CRL fingerprint",
                .type = OPTION_FLAG_ORD,
                .opt.flag = &cfg.fingerprint,
        },
        {
                .name = "hash",
                .desc = "Print the hash of the issuer name",
                .type = OPTION_FLAG_ORD,
                .opt.flag = &cfg.hash,
        },
        {
                .name = "hash_old",
                .desc = "Print an old-style (MD5) hash of the issuer name",
                .type = OPTION_FLAG_ORD,
                .opt.flag = &cfg.hash_old,
        },
        {
                .name = "in",
                .argname = "file",
                .desc = "Input file to read from (stdin if unspecified)",
                .type = OPTION_ARG,
                .opt.arg = &cfg.infile,
        },
        {
                .name = "inform",
                .argname = "format",
                .desc = "Input format (DER or PEM)",
                .type = OPTION_ARG_FORMAT,
                .opt.value = &cfg.informat,
        },
        {
                .name = "issuer",
                .desc = "Print the issuer name",
                .type = OPTION_FLAG_ORD,
                .opt.flag = &cfg.issuer,
        },
        {
                .name = "lastupdate",
                .desc = "Print the lastUpdate field",
                .type = OPTION_FLAG_ORD,
                .opt.flag = &cfg.lastupdate,
        },
        {
                .name = "nameopt",
                .argname = "options",
                .desc = "Specify certificate name options",
                .type = OPTION_ARG,
                .opt.arg = &cfg.nameopt,
        },
        {
                .name = "nextupdate",
                .desc = "Print the nextUpdate field",
                .type = OPTION_FLAG_ORD,
                .opt.flag = &cfg.nextupdate,
        },
        {
                .name = "noout",
                .desc = "Do not output the encoded version of the CRL",
                .type = OPTION_FLAG,
                .opt.flag = &cfg.noout,
        },
        {
                .name = "out",
                .argname = "file",
                .desc = "Output file to write to (stdout if unspecified)",
                .type = OPTION_ARG,
                .opt.arg = &cfg.outfile,
        },
        {
                .name = "outform",
                .argname = "format",
                .desc = "Output format (DER or PEM)",
                .type = OPTION_ARG_FORMAT,
                .opt.value = &cfg.outformat,
        },
        {
                .name = "text",
                .desc = "Print out the CRL in text form",
                .type = OPTION_FLAG,
                .opt.flag = &cfg.text,
        },
        {
                .name = "verify",
                .desc = "Verify the signature on the CRL",
                .type = OPTION_FLAG,
                .opt.flag = &cfg.verify,
        },
        {NULL},
};

static void
crl_usage(void)
{
        fprintf(stderr,
            "usage: crl [-CAfile file] [-CApath dir] [-fingerprint] [-hash]\n"
            "    [-in file] [-inform DER | PEM] [-issuer] [-lastupdate]\n"
            "    [-nextupdate] [-noout] [-out file] [-outform DER | PEM]\n"
            "    [-text]\n\n");
        options_usage(crl_options);
}

static X509_CRL *load_crl(char *file, int format);
static BIO *bio_out = NULL;

int
crl_main(int argc, char **argv)
{
        unsigned long nmflag = 0;
        X509_CRL *x = NULL;
        int ret = 1, i;
        BIO *out = NULL;
        X509_STORE *store = NULL;
        X509_STORE_CTX *ctx = NULL;
        X509_LOOKUP *lookup = NULL;
        X509_OBJECT *xobj = NULL;
        EVP_PKEY *pkey;
        const EVP_MD *digest;
        char *digest_name = NULL;

        if (pledge("stdio cpath wpath rpath", NULL) == -1) {
                perror("pledge");
                exit(1);
        }

        if (bio_out == NULL) {
                if ((bio_out = BIO_new(BIO_s_file())) != NULL) {
                        BIO_set_fp(bio_out, stdout, BIO_NOCLOSE);
                }
        }

        digest = EVP_sha256();

        memset(&cfg, 0, sizeof(cfg));
        cfg.informat = FORMAT_PEM;
        cfg.outformat = FORMAT_PEM;

        if (options_parse(argc, argv, crl_options, &digest_name, NULL) != 0) {
                crl_usage();
                goto end;
        }

        if (cfg.cafile != NULL || cfg.capath != NULL)
                cfg.verify = 1;

        if (cfg.nameopt != NULL) {
                if (set_name_ex(&nmflag, cfg.nameopt) != 1) {
                        fprintf(stderr,
                            "Invalid -nameopt argument '%s'\n",
                            cfg.nameopt);
                        goto end;
                }
        }

        if (digest_name != NULL) {
                if ((digest = EVP_get_digestbyname(digest_name)) == NULL) {
                        fprintf(stderr,
                            "Unknown message digest algorithm '%s'\n",
                            digest_name);
                        goto end;
                }
        }

        x = load_crl(cfg.infile, cfg.informat);
        if (x == NULL)
                goto end;

        if (cfg.verify) {
                store = X509_STORE_new();
                if (store == NULL)
                        goto end;
                lookup = X509_STORE_add_lookup(store, X509_LOOKUP_file());
                if (lookup == NULL)
                        goto end;
                if (!X509_LOOKUP_load_file(lookup, cfg.cafile,
                    X509_FILETYPE_PEM))
                        X509_LOOKUP_load_file(lookup, NULL,
                            X509_FILETYPE_DEFAULT);

                lookup = X509_STORE_add_lookup(store, X509_LOOKUP_hash_dir());
                if (lookup == NULL)
                        goto end;
                if (!X509_LOOKUP_add_dir(lookup, cfg.capath,
                    X509_FILETYPE_PEM))
                        X509_LOOKUP_add_dir(lookup, NULL,
                            X509_FILETYPE_DEFAULT);
                ERR_clear_error();

                if ((ctx = X509_STORE_CTX_new()) == NULL)
                        goto end;
                if ((xobj = X509_OBJECT_new()) == NULL)
                        goto end;

                if (!X509_STORE_CTX_init(ctx, store, NULL, NULL)) {
                        BIO_printf(bio_err,
                            "Error initialising X509 store\n");
                        goto end;
                }
                i = X509_STORE_get_by_subject(ctx, X509_LU_X509,
                    X509_CRL_get_issuer(x), xobj);
                if (i <= 0) {
                        BIO_printf(bio_err,
                            "Error getting CRL issuer certificate\n");
                        goto end;
                }
                pkey = X509_get_pubkey(X509_OBJECT_get0_X509(xobj));
                X509_OBJECT_free(xobj);
                xobj = NULL;
                if (!pkey) {
                        BIO_printf(bio_err,
                            "Error getting CRL issuer public key\n");
                        goto end;
                }
                i = X509_CRL_verify(x, pkey);
                EVP_PKEY_free(pkey);
                if (i < 0)
                        goto end;
                if (i == 0)
                        BIO_printf(bio_err, "verify failure\n");
                else
                        BIO_printf(bio_err, "verify OK\n");
        }

        /* Print requested information the order that the flags were given. */
        for (i = 1; i <= argc; i++) {
                if (cfg.issuer == i) {
                        print_name(bio_out, "issuer=",
                            X509_CRL_get_issuer(x), nmflag);
                }
                if (cfg.crlnumber == i) {
                        ASN1_INTEGER *crlnum;
                        crlnum = X509_CRL_get_ext_d2i(x,
                            NID_crl_number, NULL, NULL);
                        BIO_printf(bio_out, "crlNumber=");
                        if (crlnum) {
                                i2a_ASN1_INTEGER(bio_out, crlnum);
                                ASN1_INTEGER_free(crlnum);
                        } else
                                BIO_puts(bio_out, "<NONE>");
                        BIO_printf(bio_out, "\n");
                }
                if (cfg.hash == i) {
                        BIO_printf(bio_out, "%08lx\n",
                            X509_NAME_hash(X509_CRL_get_issuer(x)));
                }
#ifndef OPENSSL_NO_MD5
                if (cfg.hash_old == i) {
                        BIO_printf(bio_out, "%08lx\n",
                            X509_NAME_hash_old(X509_CRL_get_issuer(x)));
                }
#endif
                if (cfg.lastupdate == i) {
                        BIO_printf(bio_out, "lastUpdate=");
                        ASN1_TIME_print(bio_out,
                            X509_CRL_get_lastUpdate(x));
                        BIO_printf(bio_out, "\n");
                }
                if (cfg.nextupdate == i) {
                        BIO_printf(bio_out, "nextUpdate=");
                        if (X509_CRL_get_nextUpdate(x))
                                ASN1_TIME_print(bio_out,
                                    X509_CRL_get_nextUpdate(x));
                        else
                                BIO_printf(bio_out, "NONE");
                        BIO_printf(bio_out, "\n");
                }
                if (cfg.fingerprint == i) {
                        int j;
                        unsigned int n;
                        unsigned char md[EVP_MAX_MD_SIZE];

                        if (!X509_CRL_digest(x, digest, md, &n)) {
                                BIO_printf(bio_err, "out of memory\n");
                                goto end;
                        }
                        BIO_printf(bio_out, "%s Fingerprint=",
                            OBJ_nid2sn(EVP_MD_type(digest)));
                        for (j = 0; j < (int) n; j++) {
                                BIO_printf(bio_out, "%02X%c", md[j],
                                    (j + 1 == (int)n) ? '\n' : ':');
                        }
                }
        }

        out = BIO_new(BIO_s_file());
        if (out == NULL) {
                ERR_print_errors(bio_err);
                goto end;
        }
        if (cfg.outfile == NULL) {
                BIO_set_fp(out, stdout, BIO_NOCLOSE);
        } else {
                if (BIO_write_filename(out, cfg.outfile) <= 0) {
                        perror(cfg.outfile);
                        goto end;
                }
        }

        if (cfg.text)
                X509_CRL_print(out, x);

        if (cfg.noout) {
                ret = 0;
                goto end;
        }
        if (cfg.outformat == FORMAT_ASN1)
                i = (int) i2d_X509_CRL_bio(out, x);
        else if (cfg.outformat == FORMAT_PEM)
                i = PEM_write_bio_X509_CRL(out, x);
        else {
                BIO_printf(bio_err,
                    "bad output format specified for outfile\n");
                goto end;
        }
        if (!i) {
                BIO_printf(bio_err, "unable to write CRL\n");
                goto end;
        }
        ret = 0;

 end:
        BIO_free_all(out);
        BIO_free_all(bio_out);
        bio_out = NULL;
        X509_CRL_free(x);
        X509_STORE_CTX_free(ctx);
        X509_STORE_free(store);
        X509_OBJECT_free(xobj);

        return (ret);
}

static X509_CRL *
load_crl(char *infile, int format)
{
        X509_CRL *x = NULL;
        BIO *in = NULL;

        in = BIO_new(BIO_s_file());
        if (in == NULL) {
                ERR_print_errors(bio_err);
                goto end;
        }
        if (infile == NULL)
                BIO_set_fp(in, stdin, BIO_NOCLOSE);
        else {
                if (BIO_read_filename(in, infile) <= 0) {
                        perror(infile);
                        goto end;
                }
        }
        if (format == FORMAT_ASN1)
                x = d2i_X509_CRL_bio(in, NULL);
        else if (format == FORMAT_PEM)
                x = PEM_read_bio_X509_CRL(in, NULL, NULL, NULL);
        else {
                BIO_printf(bio_err,
                    "bad input format specified for input crl\n");
                goto end;
        }
        if (x == NULL) {
                BIO_printf(bio_err, "unable to load CRL\n");
                ERR_print_errors(bio_err);
                goto end;
        }

 end:
        BIO_free(in);
        return (x);
}