Adding upstream version 1:5.44.upstream/1%5.44upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 458 insertions, 0 deletions

diff --git a/src/der.c b/src/der.c
new file mode 100644
index 0000000..3a03651
--- /dev/null
+++ b/src/der.c
@@ -0,0 +1,458 @@
+/*-
+ * Copyright (c) 2016 Christos Zoulas
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+/*
+ * DER (Distinguished Encoding Rules) Parser
+ *
+ * Sources:
+ * https://en.wikipedia.org/wiki/X.690
+ * http://fm4dd.com/openssl/certexamples.htm
+ * http://blog.engelke.com/2014/10/17/parsing-ber-and-der-encoded-asn-1-objects/
+ */
+#ifndef TEST_DER
+#include "file.h"
+
+#ifndef lint
+FILE_RCSID("@(#)$File: der.c,v 1.27 2022/09/24 20:30:13 christos Exp $")
+#endif
+#else
+#define SIZE_T_FORMAT "z"
+#define CAST(a, b) ((a)(b))
+#endif
+
+#include <sys/types.h>
+
+#include <stdio.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+
+#ifndef TEST_DER
+#include "magic.h"
+#include "der.h"
+#else
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <err.h>
+#endif
+
+#define DER_BAD	CAST(uint32_t, -1)
+
+#define DER_CLASS_UNIVERSAL	0
+#define	DER_CLASS_APPLICATION	1
+#define	DER_CLASS_CONTEXT	2
+#define	DER_CLASS_PRIVATE	3
+#if defined(DEBUG_DER) || defined(TEST_DER)
+static const char der_class[] = "UACP";
+#endif
+
+#define DER_TYPE_PRIMITIVE	0
+#define DER_TYPE_CONSTRUCTED	1
+#if defined(DEBUG_DER) || defined(TEST_DER)
+static const char der_type[] = "PC";
+#endif
+
+#define	DER_TAG_EOC			0x00
+#define	DER_TAG_BOOLEAN			0x01
+#define	DER_TAG_INTEGER			0x02
+#define	DER_TAG_BIT STRING		0x03
+#define	DER_TAG_OCTET_STRING		0x04
+#define	DER_TAG_NULL			0x05
+#define	DER_TAG_OBJECT_IDENTIFIER	0x06
+#define	DER_TAG_OBJECT_DESCRIPTOR	0x07
+#define	DER_TAG_EXTERNAL		0x08
+#define	DER_TAG_REAL			0x09
+#define	DER_TAG_ENUMERATED		0x0a
+#define	DER_TAG_EMBEDDED_PDV		0x0b
+#define	DER_TAG_UTF8_STRING		0x0c
+#define	DER_TAG_RELATIVE_OID		0x0d
+#define DER_TAG_TIME			0x0e
+#define DER_TAG_RESERVED_2		0x0f
+#define	DER_TAG_SEQUENCE		0x10
+#define	DER_TAG_SET			0x11
+#define	DER_TAG_NUMERIC_STRING		0x12
+#define	DER_TAG_PRINTABLE_STRING	0x13
+#define	DER_TAG_T61_STRING		0x14
+#define	DER_TAG_VIDEOTEX_STRING		0x15
+#define	DER_TAG_IA5_STRING		0x16
+#define	DER_TAG_UTCTIME			0x17
+#define	DER_TAG_GENERALIZED_TIME	0x18
+#define	DER_TAG_GRAPHIC_STRING		0x19
+#define	DER_TAG_VISIBLE_STRING		0x1a
+#define	DER_TAG_GENERAL_STRING		0x1b
+#define	DER_TAG_UNIVERSAL_STRING	0x1c
+#define	DER_TAG_CHARACTER_STRING	0x1d
+#define	DER_TAG_BMP_STRING		0x1e
+#define	DER_TAG_DATE			0x1f
+#define	DER_TAG_TIME_OF_DAY		0x20
+#define	DER_TAG_DATE_TIME		0x21
+#define	DER_TAG_DURATION		0x22
+#define	DER_TAG_OID_IRI			0x23
+#define	DER_TAG_RELATIVE_OID_IRI	0x24
+#define	DER_TAG_LAST			0x25
+
+static const char *der__tag[] = {
+	"eoc", "bool", "int", "bit_str", "octet_str",
+	"null", "obj_id", "obj_desc", "ext", "real",
+	"enum", "embed", "utf8_str", "rel_oid", "time",
+	"res2", "seq", "set", "num_str", "prt_str",
+	"t61_str", "vid_str", "ia5_str", "utc_time", "gen_time",
+	"gr_str", "vis_str", "gen_str", "univ_str", "char_str",
+	"bmp_str", "date", "tod", "datetime", "duration",
+	"oid-iri", "rel-oid-iri",
+};
+
+#ifdef DEBUG_DER
+#define DPRINTF(a) printf a
+#else
+#define DPRINTF(a)
+#endif
+
+#ifdef TEST_DER
+static uint8_t
+getclass(uint8_t c)
+{
+	return c >> 6;
+}
+
+static uint8_t
+gettype(uint8_t c)
+{
+	return (c >> 5) & 1;
+}
+#endif
+
+static uint32_t
+gettag(const uint8_t *c, size_t *p, size_t l)
+{
+	uint32_t tag;
+
+	if (*p >= l)
+		return DER_BAD;
+
+	tag = c[(*p)++] & 0x1f;
+
+	if (tag != 0x1f)
+		return tag;
+
+	if (*p >= l)
+		return DER_BAD;
+
+	while (c[*p] >= 0x80) {
+		tag = tag * 128 + c[(*p)++] - 0x80;
+		if (*p >= l)
+			return DER_BAD;
+	}
+	return tag;
+}
+
+/*
+ * Read the length of a DER tag from the input.
+ *
+ * `c` is the input, `p` is an output parameter that specifies how much of the
+ * input we consumed, and `l` is the maximum input length.
+ *
+ * Returns the length, or DER_BAD if the end of the input is reached or the
+ * length exceeds the remaining input.
+ */
+static uint32_t
+getlength(const uint8_t *c, size_t *p, size_t l)
+{
+	uint8_t digits, i;
+	size_t len;
+	int is_onebyte_result;
+
+	if (*p >= l) {
+		DPRINTF(("%s:[1] %zu >= %zu\n", __func__, *p, l));
+		return DER_BAD;
+	}
+
+	/*
+	 * Digits can either be 0b0 followed by the result, or 0b1
+	 * followed by the number of digits of the result. In either case,
+	 * we verify that we can read so many bytes from the input.
+	 */
+	is_onebyte_result = (c[*p] & 0x80) == 0;
+	digits = c[(*p)++] & 0x7f;
+	if (*p + digits >= l) {
+		DPRINTF(("%s:[2] %zu + %u >= %zu\n", __func__, *p, digits, l));
+		return DER_BAD;
+	}
+
+	if (is_onebyte_result)
+		return digits;
+
+	/*
+	 * Decode len. We've already verified that we're allowed to read
+	 * `digits` bytes.
+	 */
+	len = 0;
+	for (i = 0; i < digits; i++)
+		len = (len << 8) | c[(*p)++];
+
+	if (len > UINT32_MAX - *p || *p + len > l) {
+		DPRINTF(("%s:[3] bad len %zu + %zu >= %zu\n",
+		    __func__, *p, len, l));
+		return DER_BAD;
+	}
+	return CAST(uint32_t, len);
+}
+
+static const char *
+der_tag(char *buf, size_t len, uint32_t tag)
+{
+	if (tag < DER_TAG_LAST)
+		strlcpy(buf, der__tag[tag], len);
+	else
+		snprintf(buf, len, "%#x", tag);
+	return buf;
+}
+
+#ifndef TEST_DER
+static int
+der_data(char *buf, size_t blen, uint32_t tag, const void *q, uint32_t len)
+{
+	uint32_t i;
+	const uint8_t *d = CAST(const uint8_t *, q);
+	switch (tag) {
+	case DER_TAG_PRINTABLE_STRING:
+	case DER_TAG_UTF8_STRING:
+	case DER_TAG_IA5_STRING:
+		return snprintf(buf, blen, "%.*s", len, RCAST(const char *, q));
+	case DER_TAG_UTCTIME:
+		if (len < 12)
+			break;
+		return snprintf(buf, blen,
+		    "20%c%c-%c%c-%c%c %c%c:%c%c:%c%c GMT", d[0], d[1], d[2],
+		    d[3], d[4], d[5], d[6], d[7], d[8], d[9], d[10], d[11]);
+	default:
+		break;
+	}
+
+	for (i = 0; i < len; i++) {
+		uint32_t z = i << 1;
+		if (z < blen - 2)
+			snprintf(buf + z, blen - z, "%.2x", d[i]);
+	}
+	return len * 2;
+}
+
+int32_t
+der_offs(struct magic_set *ms, struct magic *m, size_t nbytes)
+{
+	const uint8_t *b = RCAST(const uint8_t *, ms->search.s);
+	size_t offs = 0, len = ms->search.s_len ? ms->search.s_len : nbytes;
+
+	if (gettag(b, &offs, len) == DER_BAD) {
+		DPRINTF(("%s: bad tag 1\n", __func__));
+		return -1;
+	}
+	DPRINTF(("%s1: %u %" SIZE_T_FORMAT "u %d\n", __func__, ms->offset,
+	    offs, m->offset));
+
+	uint32_t tlen = getlength(b, &offs, len);
+	if (tlen == DER_BAD) {
+		DPRINTF(("%s: bad tag 2\n", __func__));
+		return -1;
+	}
+	DPRINTF(("%s2: %u %" SIZE_T_FORMAT "u %u\n", __func__, ms->offset,
+	    offs, tlen));
+
+	offs += ms->offset + m->offset;
+	DPRINTF(("cont_level = %d\n", m->cont_level));
+#ifdef DEBUG_DER
+	size_t i;
+	for (i = 0; i < m->cont_level; i++)
+		printf("cont_level[%" SIZE_T_FORMAT "u] = %d\n", i,
+		    ms->c.li[i].off);
+#endif
+	if (m->cont_level != 0) {
+		if (offs + tlen > nbytes)
+			return -1;
+		ms->c.li[m->cont_level - 1].off = CAST(int, offs + tlen);
+		DPRINTF(("cont_level[%u] = %d\n", m->cont_level - 1,
+		    ms->c.li[m->cont_level - 1].off));
+	}
+	return CAST(int32_t, offs);
+}
+
+int
+der_cmp(struct magic_set *ms, struct magic *m)
+{
+	const uint8_t *b = RCAST(const uint8_t *, ms->search.s);
+	const char *s = m->value.s;
+	size_t offs = 0, len = ms->search.s_len;
+	uint32_t tag, tlen;
+	char buf[128];
+
+	DPRINTF(("%s: compare %zu bytes\n", __func__, len));
+
+	tag = gettag(b, &offs, len);
+	if (tag == DER_BAD) {
+		DPRINTF(("%s: bad tag 1\n", __func__));
+		return -1;
+	}
+
+	DPRINTF(("%s1: %d %" SIZE_T_FORMAT "u %d\n", __func__, ms->offset,
+	    offs, m->offset));
+
+	tlen = getlength(b, &offs, len);
+	if (tlen == DER_BAD) {
+		DPRINTF(("%s: bad tag 2\n", __func__));
+		return -1;
+	}
+
+	der_tag(buf, sizeof(buf), tag);
+	if ((ms->flags & MAGIC_DEBUG) != 0)
+		fprintf(stderr, "%s: tag %p got=%s exp=%s\n", __func__, b,
+		    buf, s);
+	size_t slen = strlen(buf);
+
+	if (strncmp(buf, s, slen) != 0) {
+		DPRINTF(("%s: no string match %s != %s\n", __func__, buf, s));
+		return 0;
+	}
+
+	s += slen;
+
+again:
+	switch (*s) {
+	case '\0':
+		DPRINTF(("%s: EOF match\n", __func__));
+		return 1;
+	case '=':
+		s++;
+		goto val;
+	default:
+		if (!isdigit(CAST(unsigned char, *s))) {
+			DPRINTF(("%s: no digit %c\n", __func__, *s));
+			return 0;
+		}
+
+		slen = 0;
+		do
+			slen = slen * 10 + *s - '0';
+		while (isdigit(CAST(unsigned char, *++s)));
+		if ((ms->flags & MAGIC_DEBUG) != 0)
+			fprintf(stderr, "%s: len %" SIZE_T_FORMAT "u %u\n",
+			    __func__, slen, tlen);
+		if (tlen != slen) {
+			DPRINTF(("%s: len %u != %zu\n", __func__, tlen, slen));
+			return 0;
+		}
+		goto again;
+	}
+val:
+	DPRINTF(("%s: before data %" SIZE_T_FORMAT "u %u\n", __func__, offs,
+	    tlen));
+	der_data(buf, sizeof(buf), tag, b + offs, tlen);
+	if ((ms->flags & MAGIC_DEBUG) != 0)
+		fprintf(stderr, "%s: data %s %s\n", __func__, buf, s);
+	if (strcmp(buf, s) != 0 && strcmp("x", s) != 0) {
+		DPRINTF(("%s: no string match %s != %s\n", __func__, buf, s));
+		return 0;
+	}
+	strlcpy(ms->ms_value.s, buf, sizeof(ms->ms_value.s));
+	DPRINTF(("%s: complete match\n", __func__));
+	return 1;
+}
+#endif
+
+#ifdef TEST_DER
+static void
+printtag(uint32_t tag, const void *q, uint32_t len)
+{
+	const uint8_t *d = q;
+	switch (tag) {
+	case DER_TAG_PRINTABLE_STRING:
+	case DER_TAG_UTF8_STRING:
+	case DER_TAG_IA5_STRING:
+	case DER_TAG_UTCTIME:
+		printf("%.*s\n", len, (const char *)q);
+		return;
+	default:
+		break;
+	}
+
+	for (uint32_t i = 0; i < len; i++)
+		printf("%.2x", d[i]);
+	printf("\n");
+}
+
+static void
+printdata(size_t level, const void *v, size_t x, size_t l)
+{
+	const uint8_t *p = v, *ep = p + l;
+	size_t ox;
+	char buf[128];
+
+	while (p + x < ep) {
+		const uint8_t *q;
+		uint8_t c = getclass(p[x]);
+		uint8_t t = gettype(p[x]);
+		ox = x;
+//		if (x != 0)
+//		printf("%.2x %.2x %.2x\n", p[x - 1], p[x], p[x + 1]);
+		uint32_t tag = gettag(p, &x, ep - p + x);
+		if (p + x >= ep)
+			break;
+		uint32_t len = getlength(p, &x, ep - p + x);
+
+		printf("%" SIZE_T_FORMAT "u %" SIZE_T_FORMAT "u-%"
+		    SIZE_T_FORMAT "u %c,%c,%s,%u:", level, ox, x,
+		    der_class[c], der_type[t],
+		    der_tag(buf, sizeof(buf), tag), len);
+		q = p + x;
+		if (p + len > ep)
+			errx(EXIT_FAILURE, "corrupt der");
+		printtag(tag, q, len);
+		if (t != DER_TYPE_PRIMITIVE)
+			printdata(level + 1, p, x, len + x);
+		x += len;
+	}
+}
+
+int
+main(int argc, char *argv[])
+{
+	int fd;
+	struct stat st;
+	size_t l;
+	void *p;
+
+	if ((fd = open(argv[1], O_RDONLY)) == -1)
+		err(EXIT_FAILURE, "open `%s'", argv[1]);
+	if (fstat(fd, &st) == -1)
+		err(EXIT_FAILURE, "stat `%s'", argv[1]);
+	l = (size_t)st.st_size;
+	if ((p = mmap(NULL, l, PROT_READ, MAP_FILE, fd, 0)) == MAP_FAILED)
+		err(EXIT_FAILURE, "mmap `%s'", argv[1]);
+
+	printdata(0, p, 0, l);
+	munmap(p, l);
+	return 0;
+}
+#endif