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 */
41unsigned char *
42dearmor(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 */
98int
99main(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