X-Git-Url: https://vcs.maemo.org/git/?p=samba;a=blobdiff_plain;f=source%2Flibsmb%2Fasn1.c;fp=source%2Flibsmb%2Fasn1.c;h=09998407941fa242857a02efbb060f8bd2441868;hp=0000000000000000000000000000000000000000;hb=6bca4ca307d55b6dc888e56cee47aebcddbce786;hpb=7fd70fa738b636089bcc6c961aa3eaa02f20dda2

diff --git a/source/libsmb/asn1.c b/source/libsmb/asn1.c
new file mode 100644
index 0000000..0999840
--- /dev/null
+++ b/source/libsmb/asn1.c
@@ -0,0 +1,456 @@
+/* 
+   Unix SMB/CIFS implementation.
+   simple SPNEGO 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 2 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, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+
+/* free an asn1 structure */
+void asn1_free(ASN1_DATA *data)
+{
+	SAFE_FREE(data->data);
+}
+
+/* write to the ASN1 buffer, advancing the buffer pointer */
+BOOL asn1_write(ASN1_DATA *data, const void *p, int len)
+{
+	if (data->has_error) return False;
+	if (data->length < data->ofs+len) {
+		uint8 *newp;
+		newp = SMB_REALLOC(data->data, data->ofs+len);
+		if (!newp) {
+			SAFE_FREE(data->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 */
+BOOL asn1_write_uint8(ASN1_DATA *data, uint8 v)
+{
+	return asn1_write(data, &v, 1);
+}
+
+/* push a tag onto the asn1 data buffer. Used for nested structures */
+BOOL asn1_push_tag(ASN1_DATA *data, uint8 tag)
+{
+	struct nesting *nesting;
+
+	asn1_write_uint8(data, tag);
+	nesting = SMB_MALLOC_P(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(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 > 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;
+	free(nesting);
+	return True;
+}
+
+
+/* write an integer */
+BOOL asn1_write_Integer(ASN1_DATA *data, int i)
+{
+	if (!asn1_push_tag(data, ASN1_INTEGER)) return False;
+	do {
+		asn1_write_uint8(data, i);
+		i = i >> 8;
+	} while (i);
+	return asn1_pop_tag(data);
+}
+
+/* write an object ID to a ASN1 buffer */
+BOOL asn1_write_OID(ASN1_DATA *data, const char *OID)
+{
+	unsigned v, v2;
+	const char *p = (const char *)OID;
+	char *newp;
+
+	if (!asn1_push_tag(data, ASN1_OID))
+		return False;
+	v = strtol(p, &newp, 10);
+	p = newp;
+	v2 = strtol(p, &newp, 10);
+	p = newp;
+	if (!asn1_write_uint8(data, 40*v + v2))
+		return False;
+
+	while (*p) {
+		v = strtol(p, &newp, 10);
+		p = newp;
+		if (v >= (1<<28)) asn1_write_uint8(data, 0x80 | ((v>>28)&0xff));
+		if (v >= (1<<21)) asn1_write_uint8(data, 0x80 | ((v>>21)&0xff));
+		if (v >= (1<<14)) asn1_write_uint8(data, 0x80 | ((v>>14)&0xff));
+		if (v >= (1<<7)) asn1_write_uint8(data, 0x80 | ((v>>7)&0xff));
+		if (!asn1_write_uint8(data, v&0x7f))
+			return False;
+	}
+	return asn1_pop_tag(data);
+}
+
+/* write an octet string */
+BOOL asn1_write_OctetString(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 general string */
+BOOL asn1_write_GeneralString(ASN1_DATA *data, const char *s)
+{
+	asn1_push_tag(data, ASN1_GENERAL_STRING);
+	asn1_write(data, s, strlen(s));
+	asn1_pop_tag(data);
+	return !data->has_error;
+}
+
+/* write a BOOLEAN */
+BOOL asn1_write_BOOLEAN(ASN1_DATA *data, BOOL v)
+{
+	asn1_write_uint8(data, ASN1_BOOLEAN);
+	asn1_write_uint8(data, v);
+	return !data->has_error;
+}
+
+/* write a BOOLEAN - hmm, I suspect this one is the correct one, and the 
+   above boolean is bogus. Need to check */
+BOOL asn1_write_BOOLEAN2(ASN1_DATA *data, BOOL v)
+{
+	asn1_push_tag(data, ASN1_BOOLEAN);
+	asn1_write_uint8(data, v);
+	asn1_pop_tag(data);
+	return !data->has_error;
+}
+
+/* check a BOOLEAN */
+BOOL asn1_check_BOOLEAN(ASN1_DATA *data, BOOL v)
+{
+	uint8 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 ASN1_DATA structure with a lump of data, ready to be parsed */
+BOOL asn1_load(ASN1_DATA *data, DATA_BLOB blob)
+{
+	ZERO_STRUCTP(data);
+	data->data = memdup(blob.data, blob.length);
+	if (!data->data) {
+		data->has_error = True;
+		return False;
+	}
+	data->length = blob.length;
+	return True;
+}
+
+/* read from a ASN1 buffer, advancing the buffer pointer */
+BOOL asn1_read(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) {
+		data->has_error = True;
+		return False;
+	}
+
+	if (data->ofs + len > data->length) {
+		data->has_error = True;
+		return False;
+	}
+	memcpy(p, data->data + data->ofs, len);
+	data->ofs += len;
+	return True;
+}
+
+/* read a uint8 from a ASN1 buffer */
+BOOL asn1_read_uint8(ASN1_DATA *data, uint8 *v)
+{
+	return asn1_read(data, v, 1);
+}
+
+/* start reading a nested asn1 structure */
+BOOL asn1_start_tag(ASN1_DATA *data, uint8 tag)
+{
+	uint8 b;
+	struct nesting *nesting;
+	
+	if (!asn1_read_uint8(data, &b))
+		return False;
+
+	if (b != tag) {
+		data->has_error = True;
+		return False;
+	}
+	nesting = SMB_MALLOC_P(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;
+	return !data->has_error;
+}
+
+
+/* stop reading a tag */
+BOOL asn1_end_tag(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;
+	free(nesting);
+	return True;
+}
+
+/* work out how many bytes are left in this nested tag */
+int asn1_tag_remaining(ASN1_DATA *data)
+{
+	if (data->has_error)
+		return 0;
+
+	if (!data->nesting) {
+		data->has_error = True;
+		return -1;
+	}
+	return data->nesting->taglen - (data->ofs - data->nesting->start);
+}
+
+/* read an object ID from a ASN1 buffer */
+BOOL asn1_read_OID(ASN1_DATA *data, char **OID)
+{
+	uint8 b;
+	pstring oid_str;
+	fstring el;
+
+	if (!asn1_start_tag(data, ASN1_OID)) return False;
+	asn1_read_uint8(data, &b);
+
+	oid_str[0] = 0;
+	fstr_sprintf(el, "%u",  b/40);
+	pstrcat(oid_str, el);
+	fstr_sprintf(el, " %u",  b%40);
+	pstrcat(oid_str, el);
+
+	while (asn1_tag_remaining(data) > 0) {
+		unsigned v = 0;
+		do {
+			asn1_read_uint8(data, &b);
+			v = (v<<7) | (b&0x7f);
+		} while (!data->has_error && b & 0x80);
+		fstr_sprintf(el, " %u",  v);
+		pstrcat(oid_str, el);
+	}
+
+	asn1_end_tag(data);
+
+	*OID = SMB_STRDUP(oid_str);
+
+	return !data->has_error;
+}
+
+/* check that the next object ID is correct */
+BOOL asn1_check_OID(ASN1_DATA *data, const char *OID)
+{
+	char *id;
+
+	if (!asn1_read_OID(data, &id)) return False;
+
+	if (strcmp(id, OID) != 0) {
+		data->has_error = True;
+		return False;
+	}
+	free(id);
+	return True;
+}
+
+/* read a GeneralString from a ASN1 buffer */
+BOOL asn1_read_GeneralString(ASN1_DATA *data, char **s)
+{
+	int len;
+	if (!asn1_start_tag(data, ASN1_GENERAL_STRING)) return False;
+	len = asn1_tag_remaining(data);
+	if (len < 0) {
+		data->has_error = True;
+		return False;
+	}
+	*s = SMB_MALLOC(len+1);
+	if (! *s) {
+		data->has_error = True;
+		return False;
+	}
+	asn1_read(data, *s, len);
+	(*s)[len] = 0;
+	asn1_end_tag(data);
+	return !data->has_error;
+}
+
+/* read a octet string blob */
+BOOL asn1_read_OctetString(ASN1_DATA *data, 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(NULL, len);
+	asn1_read(data, blob->data, len);
+	asn1_end_tag(data);
+	return !data->has_error;
+}
+
+/* read an interger */
+BOOL asn1_read_Integer(ASN1_DATA *data, int *i)
+{
+	uint8 b;
+	*i = 0;
+	
+	if (!asn1_start_tag(data, ASN1_INTEGER)) return False;
+	while (asn1_tag_remaining(data)>0) {
+		asn1_read_uint8(data, &b);
+		*i = (*i << 8) + b;
+	}
+	return asn1_end_tag(data);	
+	
+}
+
+/* check a enumarted value is correct */
+BOOL asn1_check_enumerated(ASN1_DATA *data, int v)
+{
+	uint8 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 enumarted value to the stream */
+BOOL asn1_write_enumerated(ASN1_DATA *data, uint8 v)
+{
+	if (!asn1_push_tag(data, ASN1_ENUMERATED)) return False;
+	asn1_write_uint8(data, v);
+	asn1_pop_tag(data);
+	return !data->has_error;
+}