1/*
2 * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License").  You may not use
5 * this file except in compliance with the License.  You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <stdio.h>
11#include <string.h>
12#include <sys/types.h>
13#include "apps.h"
14#include "progs.h"
15#include <openssl/err.h>
16#include <openssl/evp.h>
17#include <openssl/x509.h>
18#include <openssl/pkcs7.h>
19#include <openssl/pem.h>
20#include <openssl/objects.h>
21
22static int add_certs_from_file(STACK_OF(X509) *stack, char *certfile);
23
24typedef enum OPTION_choice {
25    OPT_COMMON,
26    OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_NOCRL, OPT_CERTFILE,
27    OPT_PROV_ENUM
28} OPTION_CHOICE;
29
30const OPTIONS crl2pkcs7_options[] = {
31    OPT_SECTION("General"),
32    {"help", OPT_HELP, '-', "Display this summary"},
33
34    OPT_SECTION("Input"),
35    {"in", OPT_IN, '<', "Input file"},
36    {"inform", OPT_INFORM, 'F', "Input format - DER or PEM"},
37    {"nocrl", OPT_NOCRL, '-', "No crl to load, just certs from '-certfile'"},
38    {"certfile", OPT_CERTFILE, '<',
39     "File of chain of certs to a trusted CA; can be repeated"},
40
41    OPT_SECTION("Output"),
42    {"out", OPT_OUT, '>', "Output file"},
43    {"outform", OPT_OUTFORM, 'F', "Output format - DER or PEM"},
44
45    OPT_PROV_OPTIONS,
46    {NULL}
47};
48
49int crl2pkcs7_main(int argc, char **argv)
50{
51    BIO *in = NULL, *out = NULL;
52    PKCS7 *p7 = NULL;
53    PKCS7_SIGNED *p7s = NULL;
54    STACK_OF(OPENSSL_STRING) *certflst = NULL;
55    STACK_OF(X509) *cert_stack = NULL;
56    STACK_OF(X509_CRL) *crl_stack = NULL;
57    X509_CRL *crl = NULL;
58    char *infile = NULL, *outfile = NULL, *prog, *certfile;
59    int i = 0, informat = FORMAT_PEM, outformat = FORMAT_PEM, ret = 1, nocrl =
60        0;
61    OPTION_CHOICE o;
62
63    prog = opt_init(argc, argv, crl2pkcs7_options);
64    while ((o = opt_next()) != OPT_EOF) {
65        switch (o) {
66        case OPT_EOF:
67        case OPT_ERR:
68 opthelp:
69            BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
70            goto end;
71        case OPT_HELP:
72            opt_help(crl2pkcs7_options);
73            ret = 0;
74            goto end;
75        case OPT_INFORM:
76            if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
77                goto opthelp;
78            break;
79        case OPT_OUTFORM:
80            if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
81                goto opthelp;
82            break;
83        case OPT_IN:
84            infile = opt_arg();
85            break;
86        case OPT_OUT:
87            outfile = opt_arg();
88            break;
89        case OPT_NOCRL:
90            nocrl = 1;
91            break;
92        case OPT_CERTFILE:
93            if ((certflst == NULL)
94                && (certflst = sk_OPENSSL_STRING_new_null()) == NULL)
95                goto end;
96            if (!sk_OPENSSL_STRING_push(certflst, opt_arg()))
97                goto end;
98            break;
99        case OPT_PROV_CASES:
100            if (!opt_provider(o))
101                goto end;
102            break;
103        }
104    }
105
106    /* No remaining args. */
107    argc = opt_num_rest();
108    if (argc != 0)
109        goto opthelp;
110
111    if (!nocrl) {
112        in = bio_open_default(infile, 'r', informat);
113        if (in == NULL)
114            goto end;
115
116        if (informat == FORMAT_ASN1)
117            crl = d2i_X509_CRL_bio(in, NULL);
118        else if (informat == FORMAT_PEM)
119            crl = PEM_read_bio_X509_CRL(in, NULL, NULL, NULL);
120        if (crl == NULL) {
121            BIO_printf(bio_err, "unable to load CRL\n");
122            ERR_print_errors(bio_err);
123            goto end;
124        }
125    }
126
127    if ((p7 = PKCS7_new()) == NULL)
128        goto end;
129    if ((p7s = PKCS7_SIGNED_new()) == NULL)
130        goto end;
131    p7->type = OBJ_nid2obj(NID_pkcs7_signed);
132    p7->d.sign = p7s;
133    p7s->contents->type = OBJ_nid2obj(NID_pkcs7_data);
134
135    if (!ASN1_INTEGER_set(p7s->version, 1))
136        goto end;
137
138    if (crl != NULL) {
139        if ((crl_stack = sk_X509_CRL_new_null()) == NULL)
140            goto end;
141        p7s->crl = crl_stack;
142        sk_X509_CRL_push(crl_stack, crl);
143        crl = NULL;             /* now part of p7 for OPENSSL_freeing */
144    }
145
146    if (certflst != NULL) {
147        if ((cert_stack = sk_X509_new_null()) == NULL)
148            goto end;
149        p7s->cert = cert_stack;
150
151        for (i = 0; i < sk_OPENSSL_STRING_num(certflst); i++) {
152            certfile = sk_OPENSSL_STRING_value(certflst, i);
153            if (add_certs_from_file(cert_stack, certfile) < 0) {
154                BIO_printf(bio_err, "error loading certificates\n");
155                ERR_print_errors(bio_err);
156                goto end;
157            }
158        }
159    }
160
161    out = bio_open_default(outfile, 'w', outformat);
162    if (out == NULL)
163        goto end;
164
165    if (outformat == FORMAT_ASN1)
166        i = i2d_PKCS7_bio(out, p7);
167    else if (outformat == FORMAT_PEM)
168        i = PEM_write_bio_PKCS7(out, p7);
169    if (!i) {
170        BIO_printf(bio_err, "unable to write pkcs7 object\n");
171        ERR_print_errors(bio_err);
172        goto end;
173    }
174    ret = 0;
175 end:
176    sk_OPENSSL_STRING_free(certflst);
177    BIO_free(in);
178    BIO_free_all(out);
179    PKCS7_free(p7);
180    X509_CRL_free(crl);
181
182    return ret;
183}
184
185/*-
186 *----------------------------------------------------------------------
187 * int add_certs_from_file
188 *
189 *      Read a list of certificates to be checked from a file.
190 *
191 * Results:
192 *      number of certs added if successful, -1 if not.
193 *----------------------------------------------------------------------
194 */
195static int add_certs_from_file(STACK_OF(X509) *stack, char *certfile)
196{
197    BIO *in = NULL;
198    int count = 0;
199    int ret = -1;
200    STACK_OF(X509_INFO) *sk = NULL;
201    X509_INFO *xi;
202
203    in = BIO_new_file(certfile, "r");
204    if (in == NULL) {
205        BIO_printf(bio_err, "error opening the file, %s\n", certfile);
206        goto end;
207    }
208
209    /* This loads from a file, a stack of x509/crl/pkey sets */
210    sk = PEM_X509_INFO_read_bio(in, NULL, NULL, NULL);
211    if (sk == NULL) {
212        BIO_printf(bio_err, "error reading the file, %s\n", certfile);
213        goto end;
214    }
215
216    /* scan over it and pull out the CRL's */
217    while (sk_X509_INFO_num(sk)) {
218        xi = sk_X509_INFO_shift(sk);
219        if (xi->x509 != NULL) {
220            sk_X509_push(stack, xi->x509);
221            xi->x509 = NULL;
222            count++;
223        }
224        X509_INFO_free(xi);
225    }
226
227    ret = count;
228 end:
229    /* never need to OPENSSL_free x */
230    BIO_free(in);
231    sk_X509_INFO_free(sk);
232    return ret;
233}
234