Commit | Line | Data |
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1329e8cc DW |
1 | /* Extract X.509 certificate in DER form from PKCS#11 or PEM. |
2 | * | |
09a77a88 DW |
3 | * Copyright © 2014-2015 Red Hat, Inc. All Rights Reserved. |
4 | * Copyright © 2015 Intel Corporation. | |
1329e8cc DW |
5 | * |
6 | * Authors: David Howells <dhowells@redhat.com> | |
7 | * David Woodhouse <dwmw2@infradead.org> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
09a77a88 DW |
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. | |
1329e8cc DW |
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> | |
1329e8cc | 20 | #include <err.h> |
1329e8cc | 21 | #include <openssl/bio.h> |
1329e8cc | 22 | #include <openssl/pem.h> |
1329e8cc DW |
23 | #include <openssl/err.h> |
24 | #include <openssl/engine.h> | |
25 | ||
6bfb56e9 LT |
26 | /* |
27 | * OpenSSL 3.0 deprecates the OpenSSL's ENGINE API. | |
28 | * | |
29 | * Remove this if/when that API is no longer used | |
30 | */ | |
31 | #pragma GCC diagnostic ignored "-Wdeprecated-declarations" | |
32 | ||
1329e8cc DW |
33 | #define PKEY_ID_PKCS7 2 |
34 | ||
35 | static __attribute__((noreturn)) | |
36 | void format(void) | |
37 | { | |
38 | fprintf(stderr, | |
340a0253 | 39 | "Usage: extract-cert <source> <dest>\n"); |
1329e8cc DW |
40 | exit(2); |
41 | } | |
42 | ||
43 | static void display_openssl_errors(int l) | |
44 | { | |
45 | const char *file; | |
46 | char buf[120]; | |
47 | int e, line; | |
48 | ||
49 | if (ERR_peek_error() == 0) | |
50 | return; | |
51 | fprintf(stderr, "At main.c:%d:\n", l); | |
52 | ||
53 | while ((e = ERR_get_error_line(&file, &line))) { | |
54 | ERR_error_string(e, buf); | |
55 | fprintf(stderr, "- SSL %s: %s:%d\n", buf, file, line); | |
56 | } | |
57 | } | |
58 | ||
59 | static void drain_openssl_errors(void) | |
60 | { | |
61 | const char *file; | |
62 | int line; | |
63 | ||
64 | if (ERR_peek_error() == 0) | |
65 | return; | |
66 | while (ERR_get_error_line(&file, &line)) {} | |
67 | } | |
68 | ||
69 | #define ERR(cond, fmt, ...) \ | |
70 | do { \ | |
71 | bool __cond = (cond); \ | |
72 | display_openssl_errors(__LINE__); \ | |
73 | if (__cond) { \ | |
74 | err(1, fmt, ## __VA_ARGS__); \ | |
75 | } \ | |
76 | } while(0) | |
77 | ||
78 | static const char *key_pass; | |
84706caa DW |
79 | static BIO *wb; |
80 | static char *cert_dst; | |
c0d3b831 | 81 | static bool verbose; |
84706caa DW |
82 | |
83 | static void write_cert(X509 *x509) | |
84 | { | |
85 | char buf[200]; | |
86 | ||
87 | if (!wb) { | |
88 | wb = BIO_new_file(cert_dst, "wb"); | |
89 | ERR(!wb, "%s", cert_dst); | |
90 | } | |
91 | X509_NAME_oneline(X509_get_subject_name(x509), buf, sizeof(buf)); | |
7c0d35a3 | 92 | ERR(!i2d_X509_bio(wb, x509), "%s", cert_dst); |
c0d3b831 | 93 | if (verbose) |
84706caa DW |
94 | fprintf(stderr, "Extracted cert: %s\n", buf); |
95 | } | |
1329e8cc DW |
96 | |
97 | int main(int argc, char **argv) | |
98 | { | |
84706caa | 99 | char *cert_src; |
c0d3b831 | 100 | char *verbose_env; |
1329e8cc DW |
101 | |
102 | OpenSSL_add_all_algorithms(); | |
103 | ERR_load_crypto_strings(); | |
104 | ERR_clear_error(); | |
105 | ||
c0d3b831 MY |
106 | verbose_env = getenv("KBUILD_VERBOSE"); |
107 | if (verbose_env && strchr(verbose_env, '1')) | |
108 | verbose = true; | |
84706caa | 109 | |
1329e8cc DW |
110 | key_pass = getenv("KBUILD_SIGN_PIN"); |
111 | ||
112 | if (argc != 3) | |
113 | format(); | |
114 | ||
115 | cert_src = argv[1]; | |
116 | cert_dst = argv[2]; | |
117 | ||
84706caa DW |
118 | if (!cert_src[0]) { |
119 | /* Invoked with no input; create empty file */ | |
120 | FILE *f = fopen(cert_dst, "wb"); | |
121 | ERR(!f, "%s", cert_dst); | |
122 | fclose(f); | |
123 | exit(0); | |
124 | } else if (!strncmp(cert_src, "pkcs11:", 7)) { | |
1329e8cc DW |
125 | ENGINE *e; |
126 | struct { | |
127 | const char *cert_id; | |
128 | X509 *cert; | |
129 | } parms; | |
130 | ||
131 | parms.cert_id = cert_src; | |
132 | parms.cert = NULL; | |
133 | ||
134 | ENGINE_load_builtin_engines(); | |
135 | drain_openssl_errors(); | |
136 | e = ENGINE_by_id("pkcs11"); | |
137 | ERR(!e, "Load PKCS#11 ENGINE"); | |
138 | if (ENGINE_init(e)) | |
139 | drain_openssl_errors(); | |
140 | else | |
141 | ERR(1, "ENGINE_init"); | |
142 | if (key_pass) | |
143 | ERR(!ENGINE_ctrl_cmd_string(e, "PIN", key_pass, 0), "Set PKCS#11 PIN"); | |
144 | ENGINE_ctrl_cmd(e, "LOAD_CERT_CTRL", 0, &parms, NULL, 1); | |
145 | ERR(!parms.cert, "Get X.509 from PKCS#11"); | |
84706caa | 146 | write_cert(parms.cert); |
1329e8cc | 147 | } else { |
84706caa DW |
148 | BIO *b; |
149 | X509 *x509; | |
150 | ||
1329e8cc DW |
151 | b = BIO_new_file(cert_src, "rb"); |
152 | ERR(!b, "%s", cert_src); | |
84706caa DW |
153 | |
154 | while (1) { | |
155 | x509 = PEM_read_bio_X509(b, NULL, NULL, NULL); | |
156 | if (wb && !x509) { | |
157 | unsigned long err = ERR_peek_last_error(); | |
158 | if (ERR_GET_LIB(err) == ERR_LIB_PEM && | |
159 | ERR_GET_REASON(err) == PEM_R_NO_START_LINE) { | |
160 | ERR_clear_error(); | |
161 | break; | |
162 | } | |
163 | } | |
164 | ERR(!x509, "%s", cert_src); | |
165 | write_cert(x509); | |
166 | } | |
1329e8cc DW |
167 | } |
168 | ||
84706caa | 169 | BIO_free(wb); |
1329e8cc DW |
170 | |
171 | return 0; | |
172 | } |