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[J-linux.git] / certs / extract-cert.c
1 /* Extract X.509 certificate in DER form from PKCS#11 or PEM.
2  *
3  * Copyright © 2014-2015 Red Hat, Inc. All Rights Reserved.
4  * Copyright © 2015      Intel Corporation.
5  *
6  * Authors: David Howells <[email protected]>
7  *          David Woodhouse <[email protected]>
8  *
9  * This program is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public License
11  * as published by the Free Software Foundation; either version 2.1
12  * of the licence, or (at your option) any later version.
13  */
14 #define _GNU_SOURCE
15 #include <stdio.h>
16 #include <stdlib.h>
17 #include <stdint.h>
18 #include <stdbool.h>
19 #include <string.h>
20 #include <err.h>
21 #include <openssl/bio.h>
22 #include <openssl/pem.h>
23 #include <openssl/err.h>
24 #if OPENSSL_VERSION_MAJOR >= 3
25 # define USE_PKCS11_PROVIDER
26 # include <openssl/provider.h>
27 # include <openssl/store.h>
28 #else
29 # if !defined(OPENSSL_NO_ENGINE) && !defined(OPENSSL_NO_DEPRECATED_3_0)
30 #  define USE_PKCS11_ENGINE
31 #  include <openssl/engine.h>
32 # endif
33 #endif
34 #include "ssl-common.h"
35
36 #define PKEY_ID_PKCS7 2
37
38 static __attribute__((noreturn))
39 void format(void)
40 {
41         fprintf(stderr,
42                 "Usage: extract-cert <source> <dest>\n");
43         exit(2);
44 }
45
46 static const char *key_pass;
47 static BIO *wb;
48 static char *cert_dst;
49 static bool verbose;
50
51 static void write_cert(X509 *x509)
52 {
53         char buf[200];
54
55         if (!wb) {
56                 wb = BIO_new_file(cert_dst, "wb");
57                 ERR(!wb, "%s", cert_dst);
58         }
59         X509_NAME_oneline(X509_get_subject_name(x509), buf, sizeof(buf));
60         ERR(!i2d_X509_bio(wb, x509), "%s", cert_dst);
61         if (verbose)
62                 fprintf(stderr, "Extracted cert: %s\n", buf);
63 }
64
65 static X509 *load_cert_pkcs11(const char *cert_src)
66 {
67         X509 *cert = NULL;
68 #ifdef USE_PKCS11_PROVIDER
69         OSSL_STORE_CTX *store;
70
71         if (!OSSL_PROVIDER_try_load(NULL, "pkcs11", true))
72                 ERR(1, "OSSL_PROVIDER_try_load(pkcs11)");
73         if (!OSSL_PROVIDER_try_load(NULL, "default", true))
74                 ERR(1, "OSSL_PROVIDER_try_load(default)");
75
76         store = OSSL_STORE_open(cert_src, NULL, NULL, NULL, NULL);
77         ERR(!store, "OSSL_STORE_open");
78
79         while (!OSSL_STORE_eof(store)) {
80                 OSSL_STORE_INFO *info = OSSL_STORE_load(store);
81
82                 if (!info) {
83                         drain_openssl_errors(__LINE__, 0);
84                         continue;
85                 }
86                 if (OSSL_STORE_INFO_get_type(info) == OSSL_STORE_INFO_CERT) {
87                         cert = OSSL_STORE_INFO_get1_CERT(info);
88                         ERR(!cert, "OSSL_STORE_INFO_get1_CERT");
89                 }
90                 OSSL_STORE_INFO_free(info);
91                 if (cert)
92                         break;
93         }
94         OSSL_STORE_close(store);
95 #elif defined(USE_PKCS11_ENGINE)
96                 ENGINE *e;
97                 struct {
98                         const char *cert_id;
99                         X509 *cert;
100                 } parms;
101
102                 parms.cert_id = cert_src;
103                 parms.cert = NULL;
104
105                 ENGINE_load_builtin_engines();
106                 drain_openssl_errors(__LINE__, 1);
107                 e = ENGINE_by_id("pkcs11");
108                 ERR(!e, "Load PKCS#11 ENGINE");
109                 if (ENGINE_init(e))
110                         drain_openssl_errors(__LINE__, 1);
111                 else
112                         ERR(1, "ENGINE_init");
113                 if (key_pass)
114                         ERR(!ENGINE_ctrl_cmd_string(e, "PIN", key_pass, 0), "Set PKCS#11 PIN");
115                 ENGINE_ctrl_cmd(e, "LOAD_CERT_CTRL", 0, &parms, NULL, 1);
116                 ERR(!parms.cert, "Get X.509 from PKCS#11");
117                 cert = parms.cert;
118 #else
119                 fprintf(stderr, "no pkcs11 engine/provider available\n");
120                 exit(1);
121 #endif
122         return cert;
123 }
124
125 int main(int argc, char **argv)
126 {
127         char *cert_src;
128         char *verbose_env;
129
130         OpenSSL_add_all_algorithms();
131         ERR_load_crypto_strings();
132         ERR_clear_error();
133
134         verbose_env = getenv("KBUILD_VERBOSE");
135         if (verbose_env && strchr(verbose_env, '1'))
136                 verbose = true;
137
138         key_pass = getenv("KBUILD_SIGN_PIN");
139
140         if (argc != 3)
141                 format();
142
143         cert_src = argv[1];
144         cert_dst = argv[2];
145
146         if (!cert_src[0]) {
147                 /* Invoked with no input; create empty file */
148                 FILE *f = fopen(cert_dst, "wb");
149                 ERR(!f, "%s", cert_dst);
150                 fclose(f);
151                 exit(0);
152         } else if (!strncmp(cert_src, "pkcs11:", 7)) {
153                 X509 *cert = load_cert_pkcs11(cert_src);
154
155                 ERR(!cert, "load_cert_pkcs11 failed");
156                 write_cert(cert);
157         } else {
158                 BIO *b;
159                 X509 *x509;
160
161                 b = BIO_new_file(cert_src, "rb");
162                 ERR(!b, "%s", cert_src);
163
164                 while (1) {
165                         x509 = PEM_read_bio_X509(b, NULL, NULL, NULL);
166                         if (wb && !x509) {
167                                 unsigned long err = ERR_peek_last_error();
168                                 if (ERR_GET_LIB(err) == ERR_LIB_PEM &&
169                                     ERR_GET_REASON(err) == PEM_R_NO_START_LINE) {
170                                         ERR_clear_error();
171                                         break;
172                                 }
173                         }
174                         ERR(!x509, "%s", cert_src);
175                         write_cert(x509);
176                 }
177         }
178
179         BIO_free(wb);
180
181         return 0;
182 }
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