1 /*-
2 * Copyright (c) 2018, Juniper Networks, Inc.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
14 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
15 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
16 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
17 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
18 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
19 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include <sys/cdefs.h>
27 #define NEED_BRSSL_H
28 #include <libsecureboot.h>
29 #include <brssl.h>
30
31 #include "decode.h"
32
33 /**
34 * @brief decode ascii armor
35 *
36 * once we get rid of the trailing checksum
37 * we can treat as PEM.
38 *
39 * @sa rfc4880:6.2
40 */
41 unsigned char *
dearmor(char * pem,size_t nbytes,size_t * len)42 dearmor(char *pem, size_t nbytes, size_t *len)
43 {
44 #ifdef USE_BEARSSL
45 pem_object *po;
46 size_t npo;
47 #else
48 BIO *bp;
49 char *name = NULL;
50 char *header = NULL;
51 #endif
52 unsigned char *data = NULL;
53 char *cp;
54 char *ep;
55
56 /* we need to remove the Armor tail */
57 if ((cp = strstr((char *)pem, "\n=")) &&
58 (ep = strstr(cp, "\n---"))) {
59 memmove(cp, ep, nbytes - (size_t)(ep - pem));
60 nbytes -= (size_t)(ep - cp);
61 pem[nbytes] = '\0';
62 }
63 #ifdef USE_BEARSSL
64 /* we also need to remove any headers */
65 if ((cp = strstr((char *)pem, "---\n")) &&
66 (ep = strstr(cp, "\n\n"))) {
67 cp += 4;
68 ep += 2;
69 memmove(cp, ep, nbytes - (size_t)(ep - pem));
70 nbytes -= (size_t)(ep - cp);
71 pem[nbytes] = '\0';
72 }
73 if ((po = decode_pem(pem, nbytes, &npo))) {
74 data = po->data;
75 *len = po->data_len;
76 }
77 #else
78 if ((bp = BIO_new_mem_buf(pem, (int)nbytes))) {
79 long llen = (long)nbytes;
80
81 if (!PEM_read_bio(bp, &name, &header, &data, &llen))
82 data = NULL;
83 BIO_free(bp);
84 *len = (size_t)llen;
85 }
86 #endif
87 return (data);
88 }
89
90 #ifdef MAIN_DEARMOR
91 #include <unistd.h>
92 #include <fcntl.h>
93 #include <err.h>
94
95 /*
96 * Mostly a unit test.
97 */
98 int
main(int argc,char * argv[])99 main(int argc, char *argv[])
100 {
101 const char *infile, *outfile;
102 unsigned char *data;
103 size_t n, x;
104 int fd;
105 int o;
106
107 infile = outfile = NULL;
108 while ((o = getopt(argc, argv, "i:o:")) != -1) {
109 switch (o) {
110 case 'i':
111 infile = optarg;
112 break;
113 case 'o':
114 outfile = optarg;
115 break;
116 default:
117 errx(1, "unknown option: -%c", o);
118 }
119 }
120 if (!infile)
121 errx(1, "need -i infile");
122 if (outfile) {
123 if ((fd = open(outfile, O_WRONLY|O_CREAT|O_TRUNC)) < 0)
124 err(1, "cannot open %s", outfile);
125 } else {
126 fd = 1; /* stdout */
127 }
128 data = read_file(infile, &n);
129 if (!(data[0] & OPENPGP_TAG_ISTAG))
130 data = dearmor(data, n, &n);
131 for (x = 0; x < n; ) {
132 o = write(fd, &data[x], (n - x));
133 if (o < 0)
134 err(1, "cannot write");
135 x += o;
136 }
137 if (fd != 1)
138 close(fd);
139 free(data);
140 return (0);
141 }
142 #endif
143