/*

 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <time.h>

#include "apps.h"

#include "progs.h"

#include <openssl/err.h>

#include <openssl/objects.h>

#include <openssl/evp.h>

#include <openssl/x509.h>

#include <openssl/pkcs7.h>

#include <openssl/pem.h>

typedef enum OPTION_choice {

    OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,

    OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_NOOUT,

    OPT_TEXT, OPT_PRINT, OPT_PRINT_CERTS, OPT_ENGINE

} OPTION_CHOICE;

const OPTIONS pkcs7_options[] = {

    {"help", OPT_HELP, '-', "Display this summary"},

    {"inform", OPT_INFORM, 'F', "Input format - DER or PEM"},

    {"in", OPT_IN, '<', "Input file"},

    {"outform", OPT_OUTFORM, 'F', "Output format - DER or PEM"},

    {"out", OPT_OUT, '>', "Output file"},

    {"noout", OPT_NOOUT, '-', "Don't output encoded data"},

    {"text", OPT_TEXT, '-', "Print full details of certificates"},

    {"print", OPT_PRINT, '-', "Print out all fields of the PKCS7 structure"},

    {"print_certs", OPT_PRINT_CERTS, '-',

     "Print_certs  print any certs or crl in the input"},

#ifndef OPENSSL_NO_ENGINE

    {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},

#endif

    {NULL}

};

int pkcs7_main(int argc, char **argv)

{

    ENGINE *e = NULL;

    PKCS7 *p7 = NULL;

    BIO *in = NULL, *out = NULL;

    int informat = FORMAT_PEM, outformat = FORMAT_PEM;

    char *infile = NULL, *outfile = NULL, *prog;

    int i, print_certs = 0, text = 0, noout = 0, p7_print = 0, ret = 1;

    OPTION_CHOICE o;

    prog = opt_init(argc, argv, pkcs7_options);

    while ((o = opt_next()) != OPT_EOF) {

        switch (o) {

        case OPT_EOF:

        case OPT_ERR:

 opthelp:

            BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);

            goto end;

        case OPT_HELP:

            opt_help(pkcs7_options);

            ret = 0;

            goto end;

        case OPT_INFORM:

            if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))

                goto opthelp;

            break;

        case OPT_OUTFORM:

            if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))

                goto opthelp;

            break;

        case OPT_IN:

            infile = opt_arg();

            break;

        case OPT_OUT:

            outfile = opt_arg();

            break;

        case OPT_NOOUT:

            noout = 1;

            break;

        case OPT_TEXT:

            text = 1;

            break;

        case OPT_PRINT:

            p7_print = 1;

            break;

        case OPT_PRINT_CERTS:

            print_certs = 1;

            break;

        case OPT_ENGINE:

            e = setup_engine(opt_arg(), 0);

            break;

        }

    }

    argc = opt_num_rest();

    if (argc != 0)

        goto opthelp;

    in = bio_open_default(infile, 'r', informat);

    if (in == NULL)

        goto end;

    if (informat == FORMAT_ASN1)

        p7 = d2i_PKCS7_bio(in, NULL);

    else

        p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL);

    if (p7 == NULL) {

        BIO_printf(bio_err, "unable to load PKCS7 object\n");

        ERR_print_errors(bio_err);

        goto end;

    }

    out = bio_open_default(outfile, 'w', outformat);

    if (out == NULL)

        goto end;

    if (p7_print)

        PKCS7_print_ctx(out, p7, 0, NULL);

    if (print_certs) {

        STACK_OF(X509) *certs = NULL;

        STACK_OF(X509_CRL) *crls = NULL;

        i = OBJ_obj2nid(p7->type);

        switch (i) {

        case NID_pkcs7_signed:

            if (p7->d.sign != NULL) {

                certs = p7->d.sign->cert;

                crls = p7->d.sign->crl;

            }

            break;

        case NID_pkcs7_signedAndEnveloped:

            if (p7->d.signed_and_enveloped != NULL) {

                certs = p7->d.signed_and_enveloped->cert;

                crls = p7->d.signed_and_enveloped->crl;

            }

            break;

        default:

            break;

        }

        if (certs != NULL) {

            X509 *x;

            for (i = 0; i < sk_X509_num(certs); i++) {

                x = sk_X509_value(certs, i);

                if (text)

                    X509_print(out, x);

                else

                    dump_cert_text(out, x);

                if (!noout)

                    PEM_write_bio_X509(out, x);

                BIO_puts(out, "\n");

            }

        }

        if (crls != NULL) {

            X509_CRL *crl;

            for (i = 0; i < sk_X509_CRL_num(crls); i++) {

                crl = sk_X509_CRL_value(crls, i);

                X509_CRL_print_ex(out, crl, get_nameopt());

                if (!noout)

                    PEM_write_bio_X509_CRL(out, crl);

                BIO_puts(out, "\n");

            }

        }

        ret = 0;

        goto end;

    }

    if (!noout) {

        if (outformat == FORMAT_ASN1)

            i = i2d_PKCS7_bio(out, p7);

        else

            i = PEM_write_bio_PKCS7(out, p7);

        if (!i) {

            BIO_printf(bio_err, "unable to write pkcs7 object\n");

            ERR_print_errors(bio_err);

            goto end;

        }

    }

    ret = 0;

 end:

    PKCS7_free(p7);

    release_engine(e);

    BIO_free(in);

    BIO_free_all(out);

    return ret;

}