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Unix SMB/CIFS implementation.
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Copyright (C) Andrew Tridgell 2001
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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/* free an asn1 structure */
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void asn1_free(ASN1_DATA *data)
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SAFE_FREE(data->data);
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/* write to the ASN1 buffer, advancing the buffer pointer */
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BOOL asn1_write(ASN1_DATA *data, const void *p, int len)
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if (data->has_error) return False;
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if (data->length < data->ofs+len) {
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data->data = SMB_REALLOC(data->data, data->ofs+len);
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data->has_error = True;
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data->length = data->ofs+len;
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memcpy(data->data + data->ofs, p, len);
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/* useful fn for writing a uint8 */
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BOOL asn1_write_uint8(ASN1_DATA *data, uint8 v)
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return asn1_write(data, &v, 1);
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/* push a tag onto the asn1 data buffer. Used for nested structures */
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BOOL asn1_push_tag(ASN1_DATA *data, uint8 tag)
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struct nesting *nesting;
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asn1_write_uint8(data, tag);
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nesting = SMB_MALLOC_P(struct nesting);
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data->has_error = True;
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nesting->start = data->ofs;
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nesting->next = data->nesting;
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data->nesting = nesting;
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return asn1_write_uint8(data, 0xff);
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BOOL asn1_pop_tag(ASN1_DATA *data)
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struct nesting *nesting;
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nesting = data->nesting;
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data->has_error = True;
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len = data->ofs - (nesting->start+1);
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/* yes, this is ugly. We don't know in advance how many bytes the length
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of a tag will take, so we assumed 1 byte. If we were wrong then we
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need to correct our mistake */
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data->data[nesting->start] = 0x83;
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if (!asn1_write_uint8(data, 0)) return False;
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if (!asn1_write_uint8(data, 0)) return False;
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if (!asn1_write_uint8(data, 0)) return False;
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memmove(data->data+nesting->start+4, data->data+nesting->start+1, len);
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data->data[nesting->start+1] = (len>>16) & 0xFF;
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data->data[nesting->start+2] = (len>>8) & 0xFF;
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data->data[nesting->start+3] = len&0xff;
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} else if (len > 255) {
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data->data[nesting->start] = 0x82;
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if (!asn1_write_uint8(data, 0)) return False;
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if (!asn1_write_uint8(data, 0)) return False;
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memmove(data->data+nesting->start+3, data->data+nesting->start+1, len);
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data->data[nesting->start+1] = len>>8;
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data->data[nesting->start+2] = len&0xff;
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} else if (len > 127) {
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data->data[nesting->start] = 0x81;
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if (!asn1_write_uint8(data, 0)) return False;
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memmove(data->data+nesting->start+2, data->data+nesting->start+1, len);
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data->data[nesting->start+1] = len;
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data->data[nesting->start] = len;
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data->nesting = nesting->next;
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/* write an integer */
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BOOL asn1_write_Integer(ASN1_DATA *data, int i)
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if (!asn1_push_tag(data, ASN1_INTEGER)) return False;
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asn1_write_uint8(data, i);
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return asn1_pop_tag(data);
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/* write an object ID to a ASN1 buffer */
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BOOL asn1_write_OID(ASN1_DATA *data, const char *OID)
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const char *p = (const char *)OID;
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if (!asn1_push_tag(data, ASN1_OID))
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v = strtol(p, &newp, 10);
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v2 = strtol(p, &newp, 10);
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if (!asn1_write_uint8(data, 40*v + v2))
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v = strtol(p, &newp, 10);
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if (v >= (1<<28)) asn1_write_uint8(data, 0x80 | ((v>>28)&0xff));
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if (v >= (1<<21)) asn1_write_uint8(data, 0x80 | ((v>>21)&0xff));
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if (v >= (1<<14)) asn1_write_uint8(data, 0x80 | ((v>>14)&0xff));
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if (v >= (1<<7)) asn1_write_uint8(data, 0x80 | ((v>>7)&0xff));
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if (!asn1_write_uint8(data, v&0x7f))
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return asn1_pop_tag(data);
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/* write an octet string */
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BOOL asn1_write_OctetString(ASN1_DATA *data, const void *p, size_t length)
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asn1_push_tag(data, ASN1_OCTET_STRING);
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asn1_write(data, p, length);
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return !data->has_error;
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/* write a general string */
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BOOL asn1_write_GeneralString(ASN1_DATA *data, const char *s)
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asn1_push_tag(data, ASN1_GENERAL_STRING);
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asn1_write(data, s, strlen(s));
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return !data->has_error;
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/* write a BOOLEAN */
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BOOL asn1_write_BOOLEAN(ASN1_DATA *data, BOOL v)
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asn1_write_uint8(data, ASN1_BOOLEAN);
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asn1_write_uint8(data, v);
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return !data->has_error;
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/* write a BOOLEAN - hmm, I suspect this one is the correct one, and the
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above boolean is bogus. Need to check */
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BOOL asn1_write_BOOLEAN2(ASN1_DATA *data, BOOL v)
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asn1_push_tag(data, ASN1_BOOLEAN);
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asn1_write_uint8(data, v);
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return !data->has_error;
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/* check a BOOLEAN */
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BOOL asn1_check_BOOLEAN(ASN1_DATA *data, BOOL v)
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asn1_read_uint8(data, &b);
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if (b != ASN1_BOOLEAN) {
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data->has_error = True;
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asn1_read_uint8(data, &b);
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data->has_error = True;
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return !data->has_error;
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/* load a ASN1_DATA structure with a lump of data, ready to be parsed */
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BOOL asn1_load(ASN1_DATA *data, DATA_BLOB blob)
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data->data = memdup(blob.data, blob.length);
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data->has_error = True;
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data->length = blob.length;
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/* read from a ASN1 buffer, advancing the buffer pointer */
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BOOL asn1_read(ASN1_DATA *data, void *p, int len)
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if (len < 0 || data->ofs + len < data->ofs || data->ofs + len < len) {
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data->has_error = True;
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if (data->ofs + len > data->length) {
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data->has_error = True;
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memcpy(p, data->data + data->ofs, len);
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/* read a uint8 from a ASN1 buffer */
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BOOL asn1_read_uint8(ASN1_DATA *data, uint8 *v)
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return asn1_read(data, v, 1);
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/* start reading a nested asn1 structure */
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BOOL asn1_start_tag(ASN1_DATA *data, uint8 tag)
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struct nesting *nesting;
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if (!asn1_read_uint8(data, &b))
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data->has_error = True;
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nesting = SMB_MALLOC_P(struct nesting);
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data->has_error = True;
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if (!asn1_read_uint8(data, &b)) {
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if (!asn1_read_uint8(data, &b)) {
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if (!asn1_read_uint8(data, &b)) {
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nesting->taglen = (nesting->taglen << 8) | b;
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nesting->start = data->ofs;
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nesting->next = data->nesting;
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data->nesting = nesting;
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return !data->has_error;
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/* stop reading a tag */
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BOOL asn1_end_tag(ASN1_DATA *data)
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struct nesting *nesting;
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/* make sure we read it all */
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if (asn1_tag_remaining(data) != 0) {
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data->has_error = True;
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nesting = data->nesting;
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data->has_error = True;
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data->nesting = nesting->next;
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/* work out how many bytes are left in this nested tag */
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int asn1_tag_remaining(ASN1_DATA *data)
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if (!data->nesting) {
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data->has_error = True;
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return data->nesting->taglen - (data->ofs - data->nesting->start);
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/* read an object ID from a ASN1 buffer */
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BOOL asn1_read_OID(ASN1_DATA *data, char **OID)
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if (!asn1_start_tag(data, ASN1_OID)) {
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asn1_read_uint8(data, &b);
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fstr_sprintf(el, "%u", b/40);
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pstrcat(oid_str, el);
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fstr_sprintf(el, " %u", b%40);
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pstrcat(oid_str, el);
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while (asn1_tag_remaining(data) > 0) {
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asn1_read_uint8(data, &b);
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v = (v<<7) | (b&0x7f);
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} while (!data->has_error && b & 0x80);
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fstr_sprintf(el, " %u", v);
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pstrcat(oid_str, el);
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if (!data->has_error) {
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*OID = SMB_STRDUP(oid_str);
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return !data->has_error;
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/* check that the next object ID is correct */
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BOOL asn1_check_OID(ASN1_DATA *data, const char *OID)
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if (!asn1_read_OID(data, &id)) {
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if (strcmp(id, OID) != 0) {
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data->has_error = True;
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/* read a GeneralString from a ASN1 buffer */
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BOOL asn1_read_GeneralString(ASN1_DATA *data, char **s)
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if (!asn1_start_tag(data, ASN1_GENERAL_STRING)) {
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len = asn1_tag_remaining(data);
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data->has_error = True;
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str = SMB_MALLOC(len+1);
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data->has_error = True;
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asn1_read(data, str, len);
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if (!data->has_error) {
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return !data->has_error;
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/* read a octet string blob */
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BOOL asn1_read_OctetString(ASN1_DATA *data, DATA_BLOB *blob)
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if (!asn1_start_tag(data, ASN1_OCTET_STRING)) return False;
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len = asn1_tag_remaining(data);
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data->has_error = True;
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*blob = data_blob(NULL, len);
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asn1_read(data, blob->data, len);
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return !data->has_error;
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/* read an interger */
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BOOL asn1_read_Integer(ASN1_DATA *data, int *i)
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if (!asn1_start_tag(data, ASN1_INTEGER)) return False;
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while (asn1_tag_remaining(data)>0) {
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asn1_read_uint8(data, &b);
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return asn1_end_tag(data);
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/* check a enumarted value is correct */
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BOOL asn1_check_enumerated(ASN1_DATA *data, int v)
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if (!asn1_start_tag(data, ASN1_ENUMERATED)) return False;
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asn1_read_uint8(data, &b);
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data->has_error = False;
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return !data->has_error;
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/* write an enumarted value to the stream */
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BOOL asn1_write_enumerated(ASN1_DATA *data, uint8 v)
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if (!asn1_push_tag(data, ASN1_ENUMERATED)) return False;
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asn1_write_uint8(data, v);
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return !data->has_error;