1/*
2 * Copyright 1995-2019 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (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 <stdlib.h>
12#include <string.h>
13#include "apps.h"
14#include "progs.h"
15#include <openssl/bio.h>
16#include <openssl/err.h>
17#include <openssl/x509.h>
18#include <openssl/x509v3.h>
19#include <openssl/pem.h>
20
21static int cb(int ok, X509_STORE_CTX *ctx);
22static int check(X509_STORE *ctx, const char *file,
23                 STACK_OF(X509) *uchain, STACK_OF(X509) *tchain,
24                 STACK_OF(X509_CRL) *crls, int show_chain);
25static int v_verbose = 0, vflags = 0;
26
27typedef enum OPTION_choice {
28    OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
29    OPT_ENGINE, OPT_CAPATH, OPT_CAFILE, OPT_NOCAPATH, OPT_NOCAFILE,
30    OPT_UNTRUSTED, OPT_TRUSTED, OPT_CRLFILE, OPT_CRL_DOWNLOAD, OPT_SHOW_CHAIN,
31    OPT_V_ENUM, OPT_NAMEOPT,
32    OPT_VERBOSE
33} OPTION_CHOICE;
34
35const OPTIONS verify_options[] = {
36    {OPT_HELP_STR, 1, '-', "Usage: %s [options] cert.pem...\n"},
37    {OPT_HELP_STR, 1, '-', "Valid options are:\n"},
38    {"help", OPT_HELP, '-', "Display this summary"},
39    {"verbose", OPT_VERBOSE, '-',
40        "Print extra information about the operations being performed."},
41    {"CApath", OPT_CAPATH, '/', "A directory of trusted certificates"},
42    {"CAfile", OPT_CAFILE, '<', "A file of trusted certificates"},
43    {"no-CAfile", OPT_NOCAFILE, '-',
44     "Do not load the default certificates file"},
45    {"no-CApath", OPT_NOCAPATH, '-',
46     "Do not load certificates from the default certificates directory"},
47    {"untrusted", OPT_UNTRUSTED, '<', "A file of untrusted certificates"},
48    {"trusted", OPT_TRUSTED, '<', "A file of trusted certificates"},
49    {"CRLfile", OPT_CRLFILE, '<',
50        "File containing one or more CRL's (in PEM format) to load"},
51    {"crl_download", OPT_CRL_DOWNLOAD, '-',
52        "Attempt to download CRL information for this certificate"},
53    {"show_chain", OPT_SHOW_CHAIN, '-',
54        "Display information about the certificate chain"},
55    {"nameopt", OPT_NAMEOPT, 's', "Various certificate name options"},
56    OPT_V_OPTIONS,
57#ifndef OPENSSL_NO_ENGINE
58    {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
59#endif
60    {NULL}
61};
62
63int verify_main(int argc, char **argv)
64{
65    ENGINE *e = NULL;
66    STACK_OF(X509) *untrusted = NULL, *trusted = NULL;
67    STACK_OF(X509_CRL) *crls = NULL;
68    X509_STORE *store = NULL;
69    X509_VERIFY_PARAM *vpm = NULL;
70    const char *prog, *CApath = NULL, *CAfile = NULL;
71    int noCApath = 0, noCAfile = 0;
72    int vpmtouched = 0, crl_download = 0, show_chain = 0, i = 0, ret = 1;
73    OPTION_CHOICE o;
74
75    if ((vpm = X509_VERIFY_PARAM_new()) == NULL)
76        goto end;
77
78    prog = opt_init(argc, argv, verify_options);
79    while ((o = opt_next()) != OPT_EOF) {
80        switch (o) {
81        case OPT_EOF:
82        case OPT_ERR:
83            BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
84            goto end;
85        case OPT_HELP:
86            opt_help(verify_options);
87            BIO_printf(bio_err, "Recognized usages:\n");
88            for (i = 0; i < X509_PURPOSE_get_count(); i++) {
89                X509_PURPOSE *ptmp;
90                ptmp = X509_PURPOSE_get0(i);
91                BIO_printf(bio_err, "\t%-10s\t%s\n",
92                        X509_PURPOSE_get0_sname(ptmp),
93                        X509_PURPOSE_get0_name(ptmp));
94            }
95
96            BIO_printf(bio_err, "Recognized verify names:\n");
97            for (i = 0; i < X509_VERIFY_PARAM_get_count(); i++) {
98                const X509_VERIFY_PARAM *vptmp;
99                vptmp = X509_VERIFY_PARAM_get0(i);
100                BIO_printf(bio_err, "\t%-10s\n",
101                        X509_VERIFY_PARAM_get0_name(vptmp));
102            }
103            ret = 0;
104            goto end;
105        case OPT_V_CASES:
106            if (!opt_verify(o, vpm))
107                goto end;
108            vpmtouched++;
109            break;
110        case OPT_CAPATH:
111            CApath = opt_arg();
112            break;
113        case OPT_CAFILE:
114            CAfile = opt_arg();
115            break;
116        case OPT_NOCAPATH:
117            noCApath = 1;
118            break;
119        case OPT_NOCAFILE:
120            noCAfile = 1;
121            break;
122        case OPT_UNTRUSTED:
123            /* Zero or more times */
124            if (!load_certs(opt_arg(), &untrusted, FORMAT_PEM, NULL,
125                            "untrusted certificates"))
126                goto end;
127            break;
128        case OPT_TRUSTED:
129            /* Zero or more times */
130            noCAfile = 1;
131            noCApath = 1;
132            if (!load_certs(opt_arg(), &trusted, FORMAT_PEM, NULL,
133                            "trusted certificates"))
134                goto end;
135            break;
136        case OPT_CRLFILE:
137            /* Zero or more times */
138            if (!load_crls(opt_arg(), &crls, FORMAT_PEM, NULL,
139                           "other CRLs"))
140                goto end;
141            break;
142        case OPT_CRL_DOWNLOAD:
143            crl_download = 1;
144            break;
145        case OPT_ENGINE:
146            if ((e = setup_engine(opt_arg(), 0)) == NULL) {
147                /* Failure message already displayed */
148                goto end;
149            }
150            break;
151        case OPT_SHOW_CHAIN:
152            show_chain = 1;
153            break;
154        case OPT_NAMEOPT:
155            if (!set_nameopt(opt_arg()))
156                goto end;
157            break;
158        case OPT_VERBOSE:
159            v_verbose = 1;
160            break;
161        }
162    }
163    argc = opt_num_rest();
164    argv = opt_rest();
165    if (trusted != NULL && (CAfile || CApath)) {
166        BIO_printf(bio_err,
167                   "%s: Cannot use -trusted with -CAfile or -CApath\n",
168                   prog);
169        goto end;
170    }
171
172    if ((store = setup_verify(CAfile, CApath, noCAfile, noCApath)) == NULL)
173        goto end;
174    X509_STORE_set_verify_cb(store, cb);
175
176    if (vpmtouched)
177        X509_STORE_set1_param(store, vpm);
178
179    ERR_clear_error();
180
181    if (crl_download)
182        store_setup_crl_download(store);
183
184    ret = 0;
185    if (argc < 1) {
186        if (check(store, NULL, untrusted, trusted, crls, show_chain) != 1)
187            ret = -1;
188    } else {
189        for (i = 0; i < argc; i++)
190            if (check(store, argv[i], untrusted, trusted, crls,
191                      show_chain) != 1)
192                ret = -1;
193    }
194
195 end:
196    X509_VERIFY_PARAM_free(vpm);
197    X509_STORE_free(store);
198    sk_X509_pop_free(untrusted, X509_free);
199    sk_X509_pop_free(trusted, X509_free);
200    sk_X509_CRL_pop_free(crls, X509_CRL_free);
201    release_engine(e);
202    return (ret < 0 ? 2 : ret);
203}
204
205static int check(X509_STORE *ctx, const char *file,
206                 STACK_OF(X509) *uchain, STACK_OF(X509) *tchain,
207                 STACK_OF(X509_CRL) *crls, int show_chain)
208{
209    X509 *x = NULL;
210    int i = 0, ret = 0;
211    X509_STORE_CTX *csc;
212    STACK_OF(X509) *chain = NULL;
213    int num_untrusted;
214
215    x = load_cert(file, FORMAT_PEM, "certificate file");
216    if (x == NULL)
217        goto end;
218
219    csc = X509_STORE_CTX_new();
220    if (csc == NULL) {
221        printf("error %s: X.509 store context allocation failed\n",
222               (file == NULL) ? "stdin" : file);
223        goto end;
224    }
225
226    X509_STORE_set_flags(ctx, vflags);
227    if (!X509_STORE_CTX_init(csc, ctx, x, uchain)) {
228        X509_STORE_CTX_free(csc);
229        printf("error %s: X.509 store context initialization failed\n",
230               (file == NULL) ? "stdin" : file);
231        goto end;
232    }
233    if (tchain != NULL)
234        X509_STORE_CTX_set0_trusted_stack(csc, tchain);
235    if (crls != NULL)
236        X509_STORE_CTX_set0_crls(csc, crls);
237    i = X509_verify_cert(csc);
238    if (i > 0 && X509_STORE_CTX_get_error(csc) == X509_V_OK) {
239        printf("%s: OK\n", (file == NULL) ? "stdin" : file);
240        ret = 1;
241        if (show_chain) {
242            int j;
243
244            chain = X509_STORE_CTX_get1_chain(csc);
245            num_untrusted = X509_STORE_CTX_get_num_untrusted(csc);
246            printf("Chain:\n");
247            for (j = 0; j < sk_X509_num(chain); j++) {
248                X509 *cert = sk_X509_value(chain, j);
249                printf("depth=%d: ", j);
250                X509_NAME_print_ex_fp(stdout,
251                                      X509_get_subject_name(cert),
252                                      0, get_nameopt());
253                if (j < num_untrusted)
254                    printf(" (untrusted)");
255                printf("\n");
256            }
257            sk_X509_pop_free(chain, X509_free);
258        }
259    } else {
260        printf("error %s: verification failed\n", (file == NULL) ? "stdin" : file);
261    }
262    X509_STORE_CTX_free(csc);
263
264 end:
265    if (i <= 0)
266        ERR_print_errors(bio_err);
267    X509_free(x);
268
269    return ret;
270}
271
272static int cb(int ok, X509_STORE_CTX *ctx)
273{
274    int cert_error = X509_STORE_CTX_get_error(ctx);
275    X509 *current_cert = X509_STORE_CTX_get_current_cert(ctx);
276
277    if (!ok) {
278        if (current_cert != NULL) {
279            X509_NAME_print_ex(bio_err,
280                            X509_get_subject_name(current_cert),
281                            0, get_nameopt());
282            BIO_printf(bio_err, "\n");
283        }
284        BIO_printf(bio_err, "%serror %d at %d depth lookup: %s\n",
285               X509_STORE_CTX_get0_parent_ctx(ctx) ? "[CRL path] " : "",
286               cert_error,
287               X509_STORE_CTX_get_error_depth(ctx),
288               X509_verify_cert_error_string(cert_error));
289
290        /*
291         * Pretend that some errors are ok, so they don't stop further
292         * processing of the certificate chain.  Setting ok = 1 does this.
293         * After X509_verify_cert() is done, we verify that there were
294         * no actual errors, even if the returned value was positive.
295         */
296        switch (cert_error) {
297        case X509_V_ERR_NO_EXPLICIT_POLICY:
298            policies_print(ctx);
299            /* fall thru */
300        case X509_V_ERR_CERT_HAS_EXPIRED:
301            /* Continue even if the leaf is a self signed cert */
302        case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
303            /* Continue after extension errors too */
304        case X509_V_ERR_INVALID_CA:
305        case X509_V_ERR_INVALID_NON_CA:
306        case X509_V_ERR_PATH_LENGTH_EXCEEDED:
307        case X509_V_ERR_INVALID_PURPOSE:
308        case X509_V_ERR_CRL_HAS_EXPIRED:
309        case X509_V_ERR_CRL_NOT_YET_VALID:
310        case X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION:
311            ok = 1;
312        }
313
314        return ok;
315
316    }
317    if (cert_error == X509_V_OK && ok == 2)
318        policies_print(ctx);
319    if (!v_verbose)
320        ERR_clear_error();
321    return ok;
322}
323