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1329e8cc DW |
1 | /* Extract X.509 certificate in DER form from PKCS#11 or PEM. |
2 | * | |
3 | * Copyright © 2014 Red Hat, Inc. All Rights Reserved. | |
4 | * Copyright © 2015 Intel Corporation. | |
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 | |
10 | * modify it under the terms of the GNU General Public Licence | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 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 <getopt.h> | |
21 | #include <err.h> | |
22 | #include <arpa/inet.h> | |
23 | #include <openssl/bio.h> | |
24 | #include <openssl/evp.h> | |
25 | #include <openssl/pem.h> | |
26 | #include <openssl/pkcs7.h> | |
27 | #include <openssl/err.h> | |
28 | #include <openssl/engine.h> | |
29 | ||
30 | #define PKEY_ID_PKCS7 2 | |
31 | ||
32 | static __attribute__((noreturn)) | |
33 | void format(void) | |
34 | { | |
35 | fprintf(stderr, | |
36 | "Usage: scripts/extract-cert <source> <dest>\n"); | |
37 | exit(2); | |
38 | } | |
39 | ||
40 | static void display_openssl_errors(int l) | |
41 | { | |
42 | const char *file; | |
43 | char buf[120]; | |
44 | int e, line; | |
45 | ||
46 | if (ERR_peek_error() == 0) | |
47 | return; | |
48 | fprintf(stderr, "At main.c:%d:\n", l); | |
49 | ||
50 | while ((e = ERR_get_error_line(&file, &line))) { | |
51 | ERR_error_string(e, buf); | |
52 | fprintf(stderr, "- SSL %s: %s:%d\n", buf, file, line); | |
53 | } | |
54 | } | |
55 | ||
56 | static void drain_openssl_errors(void) | |
57 | { | |
58 | const char *file; | |
59 | int line; | |
60 | ||
61 | if (ERR_peek_error() == 0) | |
62 | return; | |
63 | while (ERR_get_error_line(&file, &line)) {} | |
64 | } | |
65 | ||
66 | #define ERR(cond, fmt, ...) \ | |
67 | do { \ | |
68 | bool __cond = (cond); \ | |
69 | display_openssl_errors(__LINE__); \ | |
70 | if (__cond) { \ | |
71 | err(1, fmt, ## __VA_ARGS__); \ | |
72 | } \ | |
73 | } while(0) | |
74 | ||
75 | static const char *key_pass; | |
84706caa DW |
76 | static BIO *wb; |
77 | static char *cert_dst; | |
78 | int kbuild_verbose; | |
79 | ||
80 | static void write_cert(X509 *x509) | |
81 | { | |
82 | char buf[200]; | |
83 | ||
84 | if (!wb) { | |
85 | wb = BIO_new_file(cert_dst, "wb"); | |
86 | ERR(!wb, "%s", cert_dst); | |
87 | } | |
88 | X509_NAME_oneline(X509_get_subject_name(x509), buf, sizeof(buf)); | |
7c0d35a3 | 89 | ERR(!i2d_X509_bio(wb, x509), "%s", cert_dst); |
84706caa DW |
90 | if (kbuild_verbose) |
91 | fprintf(stderr, "Extracted cert: %s\n", buf); | |
92 | } | |
1329e8cc DW |
93 | |
94 | int main(int argc, char **argv) | |
95 | { | |
84706caa | 96 | char *cert_src; |
1329e8cc DW |
97 | |
98 | OpenSSL_add_all_algorithms(); | |
99 | ERR_load_crypto_strings(); | |
100 | ERR_clear_error(); | |
101 | ||
84706caa DW |
102 | kbuild_verbose = atoi(getenv("KBUILD_VERBOSE")?:"0"); |
103 | ||
1329e8cc DW |
104 | key_pass = getenv("KBUILD_SIGN_PIN"); |
105 | ||
106 | if (argc != 3) | |
107 | format(); | |
108 | ||
109 | cert_src = argv[1]; | |
110 | cert_dst = argv[2]; | |
111 | ||
84706caa DW |
112 | if (!cert_src[0]) { |
113 | /* Invoked with no input; create empty file */ | |
114 | FILE *f = fopen(cert_dst, "wb"); | |
115 | ERR(!f, "%s", cert_dst); | |
116 | fclose(f); | |
117 | exit(0); | |
118 | } else if (!strncmp(cert_src, "pkcs11:", 7)) { | |
1329e8cc DW |
119 | ENGINE *e; |
120 | struct { | |
121 | const char *cert_id; | |
122 | X509 *cert; | |
123 | } parms; | |
124 | ||
125 | parms.cert_id = cert_src; | |
126 | parms.cert = NULL; | |
127 | ||
128 | ENGINE_load_builtin_engines(); | |
129 | drain_openssl_errors(); | |
130 | e = ENGINE_by_id("pkcs11"); | |
131 | ERR(!e, "Load PKCS#11 ENGINE"); | |
132 | if (ENGINE_init(e)) | |
133 | drain_openssl_errors(); | |
134 | else | |
135 | ERR(1, "ENGINE_init"); | |
136 | if (key_pass) | |
137 | ERR(!ENGINE_ctrl_cmd_string(e, "PIN", key_pass, 0), "Set PKCS#11 PIN"); | |
138 | ENGINE_ctrl_cmd(e, "LOAD_CERT_CTRL", 0, &parms, NULL, 1); | |
139 | ERR(!parms.cert, "Get X.509 from PKCS#11"); | |
84706caa | 140 | write_cert(parms.cert); |
1329e8cc | 141 | } else { |
84706caa DW |
142 | BIO *b; |
143 | X509 *x509; | |
144 | ||
1329e8cc DW |
145 | b = BIO_new_file(cert_src, "rb"); |
146 | ERR(!b, "%s", cert_src); | |
84706caa DW |
147 | |
148 | while (1) { | |
149 | x509 = PEM_read_bio_X509(b, NULL, NULL, NULL); | |
150 | if (wb && !x509) { | |
151 | unsigned long err = ERR_peek_last_error(); | |
152 | if (ERR_GET_LIB(err) == ERR_LIB_PEM && | |
153 | ERR_GET_REASON(err) == PEM_R_NO_START_LINE) { | |
154 | ERR_clear_error(); | |
155 | break; | |
156 | } | |
157 | } | |
158 | ERR(!x509, "%s", cert_src); | |
159 | write_cert(x509); | |
160 | } | |
1329e8cc DW |
161 | } |
162 | ||
84706caa | 163 | BIO_free(wb); |
1329e8cc DW |
164 | |
165 | return 0; | |
166 | } |