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/*
* Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (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 <string.h>
#include <sys/types.h>
#include "apps.h"
#include "progs.h"
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/x509.h>
#include <openssl/pkcs7.h>
#include <openssl/pem.h>
#include <openssl/objects.h>
static int add_certs_from_file(STACK_OF(X509) *stack, char *certfile);
typedef enum OPTION_choice {
OPT_COMMON,
OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_NOCRL, OPT_CERTFILE,
OPT_PROV_ENUM
} OPTION_CHOICE;
const OPTIONS crl2pkcs7_options[] = {
OPT_SECTION("General"),
{"help", OPT_HELP, '-', "Display this summary"},
OPT_SECTION("Input"),
{"in", OPT_IN, '<', "Input file"},
{"inform", OPT_INFORM, 'F', "Input format - DER or PEM"},
{"nocrl", OPT_NOCRL, '-', "No crl to load, just certs from '-certfile'"},
{"certfile", OPT_CERTFILE, '<',
"File of chain of certs to a trusted CA; can be repeated"},
OPT_SECTION("Output"),
{"out", OPT_OUT, '>', "Output file"},
{"outform", OPT_OUTFORM, 'F', "Output format - DER or PEM"},
OPT_PROV_OPTIONS,
{NULL}
};
int crl2pkcs7_main(int argc, char **argv)
{
BIO *in = NULL, *out = NULL;
PKCS7 *p7 = NULL;
PKCS7_SIGNED *p7s = NULL;
STACK_OF(OPENSSL_STRING) *certflst = NULL;
STACK_OF(X509) *cert_stack = NULL;
STACK_OF(X509_CRL) *crl_stack = NULL;
X509_CRL *crl = NULL;
char *infile = NULL, *outfile = NULL, *prog, *certfile;
int i = 0, informat = FORMAT_PEM, outformat = FORMAT_PEM, ret = 1, nocrl =
0;
OPTION_CHOICE o;
prog = opt_init(argc, argv, crl2pkcs7_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(crl2pkcs7_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_NOCRL:
nocrl = 1;
break;
case OPT_CERTFILE:
if ((certflst == NULL)
&& (certflst = sk_OPENSSL_STRING_new_null()) == NULL)
goto end;
if (!sk_OPENSSL_STRING_push(certflst, opt_arg()))
goto end;
break;
case OPT_PROV_CASES:
if (!opt_provider(o))
goto end;
break;
}
}
/* No remaining args. */
argc = opt_num_rest();
if (argc != 0)
goto opthelp;
if (!nocrl) {
in = bio_open_default(infile, 'r', informat);
if (in == NULL)
goto end;
if (informat == FORMAT_ASN1)
crl = d2i_X509_CRL_bio(in, NULL);
else if (informat == FORMAT_PEM)
crl = PEM_read_bio_X509_CRL(in, NULL, NULL, NULL);
if (crl == NULL) {
BIO_printf(bio_err, "unable to load CRL\n");
ERR_print_errors(bio_err);
goto end;
}
}
if ((p7 = PKCS7_new()) == NULL)
goto end;
if ((p7s = PKCS7_SIGNED_new()) == NULL)
goto end;
p7->type = OBJ_nid2obj(NID_pkcs7_signed);
p7->d.sign = p7s;
p7s->contents->type = OBJ_nid2obj(NID_pkcs7_data);
if (!ASN1_INTEGER_set(p7s->version, 1))
goto end;
if (crl != NULL) {
if ((crl_stack = sk_X509_CRL_new_null()) == NULL)
goto end;
p7s->crl = crl_stack;
sk_X509_CRL_push(crl_stack, crl);
crl = NULL; /* now part of p7 for OPENSSL_freeing */
}
if (certflst != NULL) {
if ((cert_stack = sk_X509_new_null()) == NULL)
goto end;
p7s->cert = cert_stack;
for (i = 0; i < sk_OPENSSL_STRING_num(certflst); i++) {
certfile = sk_OPENSSL_STRING_value(certflst, i);
if (add_certs_from_file(cert_stack, certfile) < 0) {
BIO_printf(bio_err, "error loading certificates\n");
ERR_print_errors(bio_err);
goto end;
}
}
}
out = bio_open_default(outfile, 'w', outformat);
if (out == NULL)
goto end;
if (outformat == FORMAT_ASN1)
i = i2d_PKCS7_bio(out, p7);
else if (outformat == FORMAT_PEM)
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:
sk_OPENSSL_STRING_free(certflst);
BIO_free(in);
BIO_free_all(out);
PKCS7_free(p7);
X509_CRL_free(crl);
return ret;
}
/*-
*----------------------------------------------------------------------
* int add_certs_from_file
*
* Read a list of certificates to be checked from a file.
*
* Results:
* number of certs added if successful, -1 if not.
*----------------------------------------------------------------------
*/
static int add_certs_from_file(STACK_OF(X509) *stack, char *certfile)
{
BIO *in = NULL;
int count = 0;
int ret = -1;
STACK_OF(X509_INFO) *sk = NULL;
X509_INFO *xi;
in = BIO_new_file(certfile, "r");
if (in == NULL) {
BIO_printf(bio_err, "error opening the file, %s\n", certfile);
goto end;
}
/* This loads from a file, a stack of x509/crl/pkey sets */
sk = PEM_X509_INFO_read_bio(in, NULL, NULL, NULL);
if (sk == NULL) {
BIO_printf(bio_err, "error reading the file, %s\n", certfile);
goto end;
}
/* scan over it and pull out the CRL's */
while (sk_X509_INFO_num(sk)) {
xi = sk_X509_INFO_shift(sk);
if (xi->x509 != NULL) {
sk_X509_push(stack, xi->x509);
xi->x509 = NULL;
count++;
}
X509_INFO_free(xi);
}
ret = count;
end:
/* never need to OPENSSL_free x */
BIO_free(in);
sk_X509_INFO_free(sk);
return ret;
}
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