util: Move asn1 to lib/util to trim down the number of subsystems.

(This used to be commit 44e1cfd2d0ef62e4ee541cec00581a7151d951b3)

3 files changed, 829 insertions, 0 deletions

diff --git a/source4/lib/util/asn1.c b/source4/lib/util/asn1.c
new file mode 100644
index 0000000000..4756c0640d
--- /dev/null
+++ b/source4/lib/util/asn1.c
@@ -0,0 +1,770 @@
+/* 
+   Unix SMB/CIFS implementation.
+   simple ASN1 routines
+   Copyright (C) Andrew Tridgell 2001
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "lib/util/asn1.h"
+
+/* allocate an asn1 structure */
+struct asn1_data *asn1_init(TALLOC_CTX *mem_ctx)
+{
+	struct asn1_data *ret = talloc_zero(mem_ctx, struct asn1_data);
+	if (ret == NULL) {
+		DEBUG(0,("asn1_init failed! out of memory\n"));
+	}
+	return ret;
+}
+
+/* free an asn1 structure */
+void asn1_free(struct asn1_data *data)
+{
+	talloc_free(data);
+}
+
+/* write to the ASN1 buffer, advancing the buffer pointer */
+bool asn1_write(struct asn1_data *data, const void *p, int len)
+{
+	if (data->has_error) return false;
+	if (data->length < data->ofs+len) {
+		uint8_t *newp;
+		newp = talloc_realloc(data, data->data, uint8_t, data->ofs+len);
+		if (!newp) {
+			asn1_free(data);
+			data->has_error = true;
+			return false;
+		}
+		data->data = newp;
+		data->length = data->ofs+len;
+	}
+	memcpy(data->data + data->ofs, p, len);
+	data->ofs += len;
+	return true;
+}
+
+/* useful fn for writing a uint8_t */
+bool asn1_write_uint8(struct asn1_data *data, uint8_t v)
+{
+	return asn1_write(data, &v, 1);
+}
+
+/* push a tag onto the asn1 data buffer. Used for nested structures */
+bool asn1_push_tag(struct asn1_data *data, uint8_t tag)
+{
+	struct nesting *nesting;
+
+	asn1_write_uint8(data, tag);
+	nesting = talloc(data, struct nesting);
+	if (!nesting) {
+		data->has_error = true;
+		return false;
+	}
+
+	nesting->start = data->ofs;
+	nesting->next = data->nesting;
+	data->nesting = nesting;
+	return asn1_write_uint8(data, 0xff);
+}
+
+/* pop a tag */
+bool asn1_pop_tag(struct asn1_data *data)
+{
+	struct nesting *nesting;
+	size_t len;
+
+	nesting = data->nesting;
+
+	if (!nesting) {
+		data->has_error = true;
+		return false;
+	}
+	len = data->ofs - (nesting->start+1);
+	/* yes, this is ugly. We don't know in advance how many bytes the length
+	   of a tag will take, so we assumed 1 byte. If we were wrong then we 
+	   need to correct our mistake */
+	if (len > 0xFFFFFF) {
+		data->data[nesting->start] = 0x84;
+		if (!asn1_write_uint8(data, 0)) return false;
+		if (!asn1_write_uint8(data, 0)) return false;
+		if (!asn1_write_uint8(data, 0)) return false;
+		if (!asn1_write_uint8(data, 0)) return false;
+		memmove(data->data+nesting->start+5, data->data+nesting->start+1, len);
+		data->data[nesting->start+1] = (len>>24) & 0xFF;
+		data->data[nesting->start+2] = (len>>16) & 0xFF;
+		data->data[nesting->start+3] = (len>>8) & 0xFF;
+		data->data[nesting->start+4] = len&0xff;
+	} else if (len > 0xFFFF) {
+		data->data[nesting->start] = 0x83;
+		if (!asn1_write_uint8(data, 0)) return false;
+		if (!asn1_write_uint8(data, 0)) return false;
+		if (!asn1_write_uint8(data, 0)) return false;
+		memmove(data->data+nesting->start+4, data->data+nesting->start+1, len);
+		data->data[nesting->start+1] = (len>>16) & 0xFF;
+		data->data[nesting->start+2] = (len>>8) & 0xFF;
+		data->data[nesting->start+3] = len&0xff;
+	} else if (len > 255) {
+		data->data[nesting->start] = 0x82;
+		if (!asn1_write_uint8(data, 0)) return false;
+		if (!asn1_write_uint8(data, 0)) return false;
+		memmove(data->data+nesting->start+3, data->data+nesting->start+1, len);
+		data->data[nesting->start+1] = len>>8;
+		data->data[nesting->start+2] = len&0xff;
+	} else if (len > 127) {
+		data->data[nesting->start] = 0x81;
+		if (!asn1_write_uint8(data, 0)) return false;
+		memmove(data->data+nesting->start+2, data->data+nesting->start+1, len);
+		data->data[nesting->start+1] = len;
+	} else {
+		data->data[nesting->start] = len;
+	}
+
+	data->nesting = nesting->next;
+	talloc_free(nesting);
+	return true;
+}
+
+/* "i" is the one's complement representation, as is the normal result of an
+ * implicit signed->unsigned conversion */
+
+static bool push_int_bigendian(struct asn1_data *data, unsigned int i, bool negative)
+{
+	uint8_t lowest = i & 0xFF;
+
+	i = i >> 8;
+	if (i != 0)
+		if (!push_int_bigendian(data, i, negative))
+			return false;
+
+	if (data->nesting->start+1 == data->ofs) {
+
+		/* We did not write anything yet, looking at the highest
+		 * valued byte */
+
+		if (negative) {
+			/* Don't write leading 0xff's */
+			if (lowest == 0xFF)
+				return true;
+
+			if ((lowest & 0x80) == 0) {
+				/* The only exception for a leading 0xff is if
+				 * the highest bit is 0, which would indicate
+				 * a positive value */
+				if (!asn1_write_uint8(data, 0xff))
+					return false;
+			}
+		} else {
+			if (lowest & 0x80) {
+				/* The highest bit of a positive integer is 1,
+				 * this would indicate a negative number. Push
+				 * a 0 to indicate a positive one */
+				if (!asn1_write_uint8(data, 0))
+					return false;
+			}
+		}
+	}
+
+	return asn1_write_uint8(data, lowest);
+}
+
+/* write an Integer without the tag framing. Needed for example for the LDAP
+ * Abandon Operation */
+
+bool asn1_write_implicit_Integer(struct asn1_data *data, int i)
+{
+	if (i == -1) {
+		/* -1 is special as it consists of all-0xff bytes. In
+                    push_int_bigendian this is the only case that is not
+                    properly handled, as all 0xff bytes would be handled as
+                    leading ones to be ignored. */
+		return asn1_write_uint8(data, 0xff);
+	} else {
+		return push_int_bigendian(data, i, i<0);
+	}
+}
+
+
+/* write an integer */
+bool asn1_write_Integer(struct asn1_data *data, int i)
+{
+	if (!asn1_push_tag(data, ASN1_INTEGER)) return false;
+	if (!asn1_write_implicit_Integer(data, i)) return false;
+	return asn1_pop_tag(data);
+}
+
+bool ber_write_OID_String(DATA_BLOB *blob, const char *OID)
+{
+	uint_t v, v2;
+	const char *p = (const char *)OID;
+	char *newp;
+	int i;
+
+	v = strtoul(p, &newp, 10);
+	if (newp[0] != '.') return false;
+	p = newp + 1;
+
+	v2 = strtoul(p, &newp, 10);
+	if (newp[0] != '.') return false;
+	p = newp + 1;
+
+	/*the ber representation can't use more space then the string one */
+	*blob = data_blob(NULL, strlen(OID));
+	if (!blob->data) return false;
+
+	blob->data[0] = 40*v + v2;
+
+	i = 1;
+	while (*p) {
+		v = strtoul(p, &newp, 10);
+		if (newp[0] == '.') {
+			p = newp + 1;
+		} else if (newp[0] == '\0') {
+			p = newp;
+		} else {
+			data_blob_free(blob);
+			return false;
+		}
+		if (v >= (1<<28)) blob->data[i++] = (0x80 | ((v>>28)&0x7f));
+		if (v >= (1<<21)) blob->data[i++] = (0x80 | ((v>>21)&0x7f));
+		if (v >= (1<<14)) blob->data[i++] = (0x80 | ((v>>14)&0x7f));
+		if (v >= (1<<7)) blob->data[i++] = (0x80 | ((v>>7)&0x7f));
+		blob->data[i++] = (v&0x7f);
+	}
+
+	blob->length = i;
+
+	return true;
+}
+
+/* write an object ID to a ASN1 buffer */
+bool asn1_write_OID(struct asn1_data *data, const char *OID)
+{
+	DATA_BLOB blob;
+
+	if (!asn1_push_tag(data, ASN1_OID)) return false;
+
+	if (!ber_write_OID_String(&blob, OID)) {
+		data->has_error = true;
+		return false;
+	}
+
+	if (!asn1_write(data, blob.data, blob.length)) {
+		data->has_error = true;
+		return false;
+	}
+	data_blob_free(&blob);
+	return asn1_pop_tag(data);
+}
+
+/* write an octet string */
+bool asn1_write_OctetString(struct asn1_data *data, const void *p, size_t length)
+{
+	asn1_push_tag(data, ASN1_OCTET_STRING);
+	asn1_write(data, p, length);
+	asn1_pop_tag(data);
+	return !data->has_error;
+}
+
+/* write a LDAP string */
+bool asn1_write_LDAPString(struct asn1_data *data, const char *s)
+{
+	asn1_write(data, s, strlen(s));
+	return !data->has_error;
+}
+
+/* write a LDAP string from a DATA_BLOB */
+bool asn1_write_DATA_BLOB_LDAPString(struct asn1_data *data, const DATA_BLOB *s)
+{
+	asn1_write(data, s->data, s->length);
+	return !data->has_error;
+}
+
+/* write a general string */
+bool asn1_write_GeneralString(struct asn1_data *data, const char *s)
+{
+	asn1_push_tag(data, ASN1_GENERAL_STRING);
+	asn1_write_LDAPString(data, s);
+	asn1_pop_tag(data);
+	return !data->has_error;
+}
+
+bool asn1_write_ContextSimple(struct asn1_data *data, uint8_t num, DATA_BLOB *blob)
+{
+	asn1_push_tag(data, ASN1_CONTEXT_SIMPLE(num));
+	asn1_write(data, blob->data, blob->length);
+	asn1_pop_tag(data);
+	return !data->has_error;
+}
+
+/* write a BOOLEAN */
+bool asn1_write_BOOLEAN(struct asn1_data *data, bool v)
+{
+	asn1_push_tag(data, ASN1_BOOLEAN);
+	asn1_write_uint8(data, v ? 0xFF : 0);
+	asn1_pop_tag(data);
+	return !data->has_error;
+}
+
+bool asn1_read_BOOLEAN(struct asn1_data *data, bool *v)
+{
+	uint8_t tmp = 0;
+	asn1_start_tag(data, ASN1_BOOLEAN);
+	asn1_read_uint8(data, &tmp);
+	if (tmp == 0xFF) {
+		*v = true;
+	} else {
+		*v = false;
+	}
+	asn1_end_tag(data);
+	return !data->has_error;
+}
+
+/* check a BOOLEAN */
+bool asn1_check_BOOLEAN(struct asn1_data *data, bool v)
+{
+	uint8_t b = 0;
+
+	asn1_read_uint8(data, &b);
+	if (b != ASN1_BOOLEAN) {
+		data->has_error = true;
+		return false;
+	}
+	asn1_read_uint8(data, &b);
+	if (b != v) {
+		data->has_error = true;
+		return false;
+	}
+	return !data->has_error;
+}
+
+
+/* load a struct asn1_data structure with a lump of data, ready to be parsed */
+bool asn1_load(struct asn1_data *data, DATA_BLOB blob)
+{
+	ZERO_STRUCTP(data);
+	data->data = talloc_memdup(data, blob.data, blob.length);
+	if (!data->data) {
+		data->has_error = true;
+		return false;
+	}
+	data->length = blob.length;
+	return true;
+}
+
+/* Peek into an ASN1 buffer, not advancing the pointer */
+bool asn1_peek(struct asn1_data *data, void *p, int len)
+{
+	if (data->has_error)
+		return false;
+
+	if (len < 0 || data->ofs + len < data->ofs || data->ofs + len < len)
+		return false;
+
+	if (data->ofs + len > data->length) {
+		/* we need to mark the buffer as consumed, so the caller knows
+		   this was an out of data error, and not a decode error */
+		data->ofs = data->length;
+		return false;
+	}
+
+	memcpy(p, data->data + data->ofs, len);
+	return true;
+}
+
+/* read from a ASN1 buffer, advancing the buffer pointer */
+bool asn1_read(struct asn1_data *data, void *p, int len)
+{
+	if (!asn1_peek(data, p, len)) {
+		data->has_error = true;
+		return false;
+	}
+
+	data->ofs += len;
+	return true;
+}
+
+/* read a uint8_t from a ASN1 buffer */
+bool asn1_read_uint8(struct asn1_data *data, uint8_t *v)
+{
+	return asn1_read(data, v, 1);
+}
+
+bool asn1_peek_uint8(struct asn1_data *data, uint8_t *v)
+{
+	return asn1_peek(data, v, 1);
+}
+
+bool asn1_peek_tag(struct asn1_data *data, uint8_t tag)
+{
+	uint8_t b;
+
+	if (asn1_tag_remaining(data) <= 0) {
+		return false;
+	}
+
+	if (!asn1_peek_uint8(data, &b))
+		return false;
+
+	return (b == tag);
+}
+
+/* start reading a nested asn1 structure */
+bool asn1_start_tag(struct asn1_data *data, uint8_t tag)
+{
+	uint8_t b;
+	struct nesting *nesting;
+	
+	if (!asn1_read_uint8(data, &b))
+		return false;
+
+	if (b != tag) {
+		data->has_error = true;
+		return false;
+	}
+	nesting = talloc(data, struct nesting);
+	if (!nesting) {
+		data->has_error = true;
+		return false;
+	}
+
+	if (!asn1_read_uint8(data, &b)) {
+		return false;
+	}
+
+	if (b & 0x80) {
+		int n = b & 0x7f;
+		if (!asn1_read_uint8(data, &b))
+			return false;
+		nesting->taglen = b;
+		while (n > 1) {
+			if (!asn1_read_uint8(data, &b)) 
+				return false;
+			nesting->taglen = (nesting->taglen << 8) | b;
+			n--;
+		}
+	} else {
+		nesting->taglen = b;
+	}
+	nesting->start = data->ofs;
+	nesting->next = data->nesting;
+	data->nesting = nesting;
+	if (asn1_tag_remaining(data) == -1) {
+		return false;
+	}
+	return !data->has_error;
+}
+
+/* stop reading a tag */
+bool asn1_end_tag(struct asn1_data *data)
+{
+	struct nesting *nesting;
+
+	/* make sure we read it all */
+	if (asn1_tag_remaining(data) != 0) {
+		data->has_error = true;
+		return false;
+	}
+
+	nesting = data->nesting;
+
+	if (!nesting) {
+		data->has_error = true;
+		return false;
+	}
+
+	data->nesting = nesting->next;
+	talloc_free(nesting);
+	return true;
+}
+
+/* work out how many bytes are left in this nested tag */
+int asn1_tag_remaining(struct asn1_data *data)
+{
+	int remaining;
+	if (data->has_error) {
+		return -1;
+	}
+
+	if (!data->nesting) {
+		data->has_error = true;
+		return -1;
+	}
+	remaining = data->nesting->taglen - (data->ofs - data->nesting->start);
+	if (remaining > (data->length - data->ofs)) {
+		data->has_error = true;
+		return -1;
+	}
+	return remaining;
+}
+
+/* read an object ID from a data blob */
+bool ber_read_OID_String(TALLOC_CTX *mem_ctx, DATA_BLOB blob, const char **OID)
+{
+	int i;
+	uint8_t *b;
+	uint_t v;
+	char *tmp_oid = NULL;
+
+	if (blob.length < 2) return false;
+
+	b = blob.data;
+
+	tmp_oid = talloc_asprintf(mem_ctx, "%u",  b[0]/40);
+	if (!tmp_oid) goto nomem;
+	tmp_oid = talloc_asprintf_append_buffer(tmp_oid, ".%u",  b[0]%40);
+	if (!tmp_oid) goto nomem;
+
+	for(i = 1, v = 0; i < blob.length; i++) {
+		v = (v<<7) | (b[i]&0x7f);
+		if ( ! (b[i] & 0x80)) {
+			tmp_oid = talloc_asprintf_append_buffer(tmp_oid, ".%u",  v);
+			v = 0;
+		}
+		if (!tmp_oid) goto nomem;
+	}
+
+	if (v != 0) {
+		talloc_free(tmp_oid);
+		return false;
+	}
+
+	*OID = tmp_oid;
+	return true;
+
+nomem:	
+	return false;
+}
+
+/* read an object ID from a ASN1 buffer */
+bool asn1_read_OID(struct asn1_data *data, TALLOC_CTX *mem_ctx, const char **OID)
+{
+	DATA_BLOB blob;
+	int len;
+
+	if (!asn1_start_tag(data, ASN1_OID)) return false;
+
+	len = asn1_tag_remaining(data);
+	if (len < 0) {
+		data->has_error = true;
+		return false;
+	}
+
+	blob = data_blob(NULL, len);
+	if (!blob.data) {
+		data->has_error = true;
+		return false;
+	}
+
+	asn1_read(data, blob.data, len);
+	asn1_end_tag(data);
+	if (data->has_error) {
+		data_blob_free(&blob);
+		return false;
+	}
+
+	if (!ber_read_OID_String(mem_ctx, blob, OID)) {
+		data->has_error = true;
+		data_blob_free(&blob);
+		return false;
+	}
+
+	data_blob_free(&blob);
+	return true;
+}
+
+/* check that the next object ID is correct */
+bool asn1_check_OID(struct asn1_data *data, const char *OID)
+{
+	const char *id;
+
+	if (!asn1_read_OID(data, data, &id)) return false;
+
+	if (strcmp(id, OID) != 0) {
+		talloc_free(discard_const(id));
+		data->has_error = true;
+		return false;
+	}
+	talloc_free(discard_const(id));
+	return true;
+}
+
+/* read a LDAPString from a ASN1 buffer */
+bool asn1_read_LDAPString(struct asn1_data *data, TALLOC_CTX *mem_ctx, char **s)
+{
+	int len;
+	len = asn1_tag_remaining(data);
+	if (len < 0) {
+		data->has_error = true;
+		return false;
+	}
+	*s = talloc_array(mem_ctx, char, len+1);
+	if (! *s) {
+		data->has_error = true;
+		return false;
+	}
+	asn1_read(data, *s, len);
+	(*s)[len] = 0;
+	return !data->has_error;
+}
+
+
+/* read a GeneralString from a ASN1 buffer */
+bool asn1_read_GeneralString(struct asn1_data *data, TALLOC_CTX *mem_ctx, char **s)
+{
+	if (!asn1_start_tag(data, ASN1_GENERAL_STRING)) return false;
+	if (!asn1_read_LDAPString(data, mem_ctx, s)) return false;
+	return asn1_end_tag(data);
+}
+
+
+/* read a octet string blob */
+bool asn1_read_OctetString(struct asn1_data *data, TALLOC_CTX *mem_ctx, DATA_BLOB *blob)
+{
+	int len;
+	ZERO_STRUCTP(blob);
+	if (!asn1_start_tag(data, ASN1_OCTET_STRING)) return false;
+	len = asn1_tag_remaining(data);
+	if (len < 0) {
+		data->has_error = true;
+		return false;
+	}
+	*blob = data_blob_talloc(mem_ctx, NULL, len+1);
+	if (!blob->data) {
+		data->has_error = true;
+		return false;
+	}
+	asn1_read(data, blob->data, len);
+	asn1_end_tag(data);
+	blob->length--;
+	blob->data[len] = 0;
+	
+	if (data->has_error) {
+		data_blob_free(blob);
+		*blob = data_blob(NULL, 0);
+		return false;
+	}
+	return true;
+}
+
+bool asn1_read_ContextSimple(struct asn1_data *data, uint8_t num, DATA_BLOB *blob)
+{
+	int len;
+	ZERO_STRUCTP(blob);
+	if (!asn1_start_tag(data, ASN1_CONTEXT_SIMPLE(num))) return false;
+	len = asn1_tag_remaining(data);
+	if (len < 0) {
+		data->has_error = true;
+		return false;
+	}
+	*blob = data_blob(NULL, len);
+	if ((len != 0) && (!blob->data)) {
+		data->has_error = true;
+		return false;
+	}
+	asn1_read(data, blob->data, len);
+	asn1_end_tag(data);
+	return !data->has_error;
+}
+
+/* read an integer without tag*/
+bool asn1_read_implicit_Integer(struct asn1_data *data, int *i)
+{
+	uint8_t b;
+	*i = 0;
+
+	while (!data->has_error && asn1_tag_remaining(data)>0) {
+		if (!asn1_read_uint8(data, &b)) return false;
+		*i = (*i << 8) + b;
+	}
+	return !data->has_error;	
+	
+}
+
+/* read an integer */
+bool asn1_read_Integer(struct asn1_data *data, int *i)
+{
+	*i = 0;
+
+	if (!asn1_start_tag(data, ASN1_INTEGER)) return false;
+	if (!asn1_read_implicit_Integer(data, i)) return false;
+	return asn1_end_tag(data);	
+}
+
+/* read an integer */
+bool asn1_read_enumerated(struct asn1_data *data, int *v)
+{
+	*v = 0;
+	
+	if (!asn1_start_tag(data, ASN1_ENUMERATED)) return false;
+	while (!data->has_error && asn1_tag_remaining(data)>0) {
+		uint8_t b;
+		asn1_read_uint8(data, &b);
+		*v = (*v << 8) + b;
+	}
+	return asn1_end_tag(data);	
+}
+
+/* check a enumerated value is correct */
+bool asn1_check_enumerated(struct asn1_data *data, int v)
+{
+	uint8_t b;
+	if (!asn1_start_tag(data, ASN1_ENUMERATED)) return false;
+	asn1_read_uint8(data, &b);
+	asn1_end_tag(data);
+
+	if (v != b)
+		data->has_error = false;
+
+	return !data->has_error;
+}
+
+/* write an enumerated value to the stream */
+bool asn1_write_enumerated(struct asn1_data *data, uint8_t v)
+{
+	if (!asn1_push_tag(data, ASN1_ENUMERATED)) return false;
+	asn1_write_uint8(data, v);
+	asn1_pop_tag(data);
+	return !data->has_error;
+}
+
+/*
+  check if a ASN.1 blob is a full tag
+*/
+NTSTATUS asn1_full_tag(DATA_BLOB blob, uint8_t tag, size_t *packet_size)
+{
+	struct asn1_data *asn1 = asn1_init(NULL);
+	int size;
+
+	NT_STATUS_HAVE_NO_MEMORY(asn1);
+
+	asn1->data = blob.data;
+	asn1->length = blob.length;
+	asn1_start_tag(asn1, tag);
+	if (asn1->has_error) {
+		talloc_free(asn1);
+		return STATUS_MORE_ENTRIES;
+	}
+	size = asn1_tag_remaining(asn1) + asn1->ofs;
+
+	talloc_free(asn1);
+
+	if (size > blob.length) {
+		return STATUS_MORE_ENTRIES;
+	}		
+
+	*packet_size = size;
+	return NT_STATUS_OK;
+}
diff --git a/source4/lib/util/asn1.h b/source4/lib/util/asn1.h
new file mode 100644
index 0000000000..34aa1e2cb9
--- /dev/null
+++ b/source4/lib/util/asn1.h
@@ -0,0 +1,54 @@
+/* 
+   Unix SMB/CIFS implementation.   
+   simple ASN1 code
+   Copyright (C) Andrew Tridgell 2001
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef _ASN_1_H
+#define _ASN_1_H
+
+struct nesting {
+	off_t start;
+	size_t taglen; /* for parsing */
+	struct nesting *next;
+};
+
+struct asn1_data {
+	uint8_t *data;
+	size_t length;
+	off_t ofs;
+	struct nesting *nesting;
+	bool has_error;
+};
+
+#define ASN1_APPLICATION(x) ((x)+0x60)
+#define ASN1_APPLICATION_SIMPLE(x) ((x)+0x40)
+#define ASN1_SEQUENCE(x) ((x)+0x30)
+#define ASN1_CONTEXT(x) ((x)+0xa0)
+#define ASN1_CONTEXT_SIMPLE(x) ((x)+0x80)
+#define ASN1_GENERAL_STRING 0x1b
+#define ASN1_OCTET_STRING 0x4
+#define ASN1_OID 0x6
+#define ASN1_BOOLEAN 0x1
+#define ASN1_INTEGER 0x2
+#define ASN1_ENUMERATED 0xa
+#define ASN1_SET 0x31
+
+#define ASN1_MAX_OIDS 20
+
+#include "lib/util/asn1_proto.h"
+
+#endif /* _ASN_1_H */
diff --git a/source4/lib/util/config.mk b/source4/lib/util/config.mk
index 01ad14aa95..53a55bf7af 100644
--- a/source4/lib/util/config.mk
+++ b/source4/lib/util/config.mk
@@ -34,6 +34,11 @@ PUBLIC_DEPENDENCIES = \
 		SOCKET_WRAPPER EXT_NSL \
 		CHARSET EXECINFO
 
+[SUBSYSTEM::ASN1_UTIL]
+PUBLIC_PROTO_HEADER = asn1_proto.h
+PUBLIC_HEADERS = asn1.h
+OBJ_FILES = asn1.o
+
 [SUBSYSTEM::UNIX_PRIVS]
 PRIVATE_PROTO_HEADER = unix_privs.h
 OBJ_FILES = unix_privs.o