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https://github.com/samba-team/samba.git
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a7250eb142
Signed-off-by: Stefan Metzmacher <metze@samba.org>
947 lines
22 KiB
C
947 lines
22 KiB
C
/*
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Unix SMB/CIFS implementation.
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simple ASN1 routines
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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 3 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, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "../lib/util/asn1.h"
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/* allocate an asn1 structure */
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struct asn1_data *asn1_init(TALLOC_CTX *mem_ctx)
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{
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struct asn1_data *ret = talloc_zero(mem_ctx, struct asn1_data);
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if (ret == NULL) {
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DEBUG(0,("asn1_init failed! out of memory\n"));
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}
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return ret;
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}
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/* free an asn1 structure */
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void asn1_free(struct asn1_data *data)
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{
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talloc_free(data);
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}
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/* write to the ASN1 buffer, advancing the buffer pointer */
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bool asn1_write(struct asn1_data *data, const void *p, int len)
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{
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if (data->has_error) return false;
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if (data->length < data->ofs+len) {
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uint8_t *newp;
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newp = talloc_realloc(data, data->data, uint8_t, data->ofs+len);
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if (!newp) {
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asn1_free(data);
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data->has_error = true;
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return false;
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}
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data->data = newp;
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data->length = data->ofs+len;
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}
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memcpy(data->data + data->ofs, p, len);
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data->ofs += len;
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return true;
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}
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/* useful fn for writing a uint8_t */
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bool asn1_write_uint8(struct asn1_data *data, uint8_t v)
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{
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return asn1_write(data, &v, 1);
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}
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/* push a tag onto the asn1 data buffer. Used for nested structures */
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bool asn1_push_tag(struct asn1_data *data, uint8_t tag)
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{
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struct nesting *nesting;
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asn1_write_uint8(data, tag);
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nesting = talloc(data, struct nesting);
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if (!nesting) {
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data->has_error = true;
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return false;
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}
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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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}
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/* pop a tag */
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bool asn1_pop_tag(struct asn1_data *data)
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{
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struct nesting *nesting;
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size_t len;
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nesting = data->nesting;
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if (!nesting) {
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data->has_error = true;
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return false;
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}
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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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if (len > 0xFFFFFF) {
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data->data[nesting->start] = 0x84;
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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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if (!asn1_write_uint8(data, 0)) return false;
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memmove(data->data+nesting->start+5, data->data+nesting->start+1, len);
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data->data[nesting->start+1] = (len>>24) & 0xFF;
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data->data[nesting->start+2] = (len>>16) & 0xFF;
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data->data[nesting->start+3] = (len>>8) & 0xFF;
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data->data[nesting->start+4] = len&0xff;
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} else if (len > 0xFFFF) {
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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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} else {
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data->data[nesting->start] = len;
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}
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data->nesting = nesting->next;
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talloc_free(nesting);
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return true;
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}
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/* "i" is the one's complement representation, as is the normal result of an
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* implicit signed->unsigned conversion */
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static bool push_int_bigendian(struct asn1_data *data, unsigned int i, bool negative)
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{
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uint8_t lowest = i & 0xFF;
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i = i >> 8;
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if (i != 0)
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if (!push_int_bigendian(data, i, negative))
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return false;
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if (data->nesting->start+1 == data->ofs) {
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/* We did not write anything yet, looking at the highest
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* valued byte */
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if (negative) {
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/* Don't write leading 0xff's */
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if (lowest == 0xFF)
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return true;
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if ((lowest & 0x80) == 0) {
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/* The only exception for a leading 0xff is if
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* the highest bit is 0, which would indicate
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* a positive value */
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if (!asn1_write_uint8(data, 0xff))
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return false;
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}
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} else {
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if (lowest & 0x80) {
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/* The highest bit of a positive integer is 1,
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* this would indicate a negative number. Push
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* a 0 to indicate a positive one */
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if (!asn1_write_uint8(data, 0))
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return false;
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}
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}
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}
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return asn1_write_uint8(data, lowest);
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}
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/* write an Integer without the tag framing. Needed for example for the LDAP
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* Abandon Operation */
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bool asn1_write_implicit_Integer(struct asn1_data *data, int i)
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{
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if (i == -1) {
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/* -1 is special as it consists of all-0xff bytes. In
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push_int_bigendian this is the only case that is not
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properly handled, as all 0xff bytes would be handled as
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leading ones to be ignored. */
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return asn1_write_uint8(data, 0xff);
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} else {
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return push_int_bigendian(data, i, i<0);
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}
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}
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/* write an integer */
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bool asn1_write_Integer(struct asn1_data *data, int i)
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{
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if (!asn1_push_tag(data, ASN1_INTEGER)) return false;
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if (!asn1_write_implicit_Integer(data, i)) return false;
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return asn1_pop_tag(data);
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}
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/* write a BIT STRING */
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bool asn1_write_BitString(struct asn1_data *data, const void *p, size_t length, uint8_t padding)
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{
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if (!asn1_push_tag(data, ASN1_BIT_STRING)) return false;
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if (!asn1_write_uint8(data, padding)) return false;
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if (!asn1_write(data, p, length)) return false;
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return asn1_pop_tag(data);
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}
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bool ber_write_OID_String(TALLOC_CTX *mem_ctx, DATA_BLOB *blob, const char *OID)
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{
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unsigned int v, v2;
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const char *p = (const char *)OID;
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char *newp;
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int i;
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v = strtoul(p, &newp, 10);
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if (newp[0] != '.') return false;
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p = newp + 1;
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v2 = strtoul(p, &newp, 10);
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if (newp[0] != '.') return false;
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p = newp + 1;
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/*the ber representation can't use more space then the string one */
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*blob = data_blob_talloc(mem_ctx, NULL, strlen(OID));
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if (!blob->data) return false;
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blob->data[0] = 40*v + v2;
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i = 1;
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while (*p) {
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v = strtoul(p, &newp, 10);
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if (newp[0] == '.') {
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p = newp + 1;
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} else if (newp[0] == '\0') {
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p = newp;
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} else {
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data_blob_free(blob);
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return false;
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}
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if (v >= (1<<28)) blob->data[i++] = (0x80 | ((v>>28)&0x7f));
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if (v >= (1<<21)) blob->data[i++] = (0x80 | ((v>>21)&0x7f));
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if (v >= (1<<14)) blob->data[i++] = (0x80 | ((v>>14)&0x7f));
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if (v >= (1<<7)) blob->data[i++] = (0x80 | ((v>>7)&0x7f));
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blob->data[i++] = (v&0x7f);
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}
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blob->length = i;
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return true;
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}
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/**
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* Serialize partial OID string.
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* Partial OIDs are in the form:
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* 1:2.5.6:0x81
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* 1:2.5.6:0x8182
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*/
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bool ber_write_partial_OID_String(TALLOC_CTX *mem_ctx, DATA_BLOB *blob, const char *partial_oid)
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{
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TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
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char *oid = talloc_strdup(tmp_ctx, partial_oid);
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char *p;
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/* truncate partial part so ber_write_OID_String() works */
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p = strchr(oid, ':');
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if (p) {
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*p = '\0';
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p++;
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}
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if (!ber_write_OID_String(mem_ctx, blob, oid)) {
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talloc_free(tmp_ctx);
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return false;
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}
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/* Add partially endcoded subidentifier */
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if (p) {
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DATA_BLOB tmp_blob = strhex_to_data_blob(tmp_ctx, p);
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data_blob_append(mem_ctx, blob, tmp_blob.data, tmp_blob.length);
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}
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talloc_free(tmp_ctx);
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return true;
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}
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/* write an object ID to a ASN1 buffer */
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bool asn1_write_OID(struct asn1_data *data, const char *OID)
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{
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DATA_BLOB blob;
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if (!asn1_push_tag(data, ASN1_OID)) return false;
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if (!ber_write_OID_String(NULL, &blob, OID)) {
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data->has_error = true;
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return false;
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}
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if (!asn1_write(data, blob.data, blob.length)) {
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data_blob_free(&blob);
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data->has_error = true;
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return false;
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}
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data_blob_free(&blob);
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return asn1_pop_tag(data);
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}
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/* write an octet string */
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bool asn1_write_OctetString(struct asn1_data *data, const void *p, size_t length)
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{
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asn1_push_tag(data, ASN1_OCTET_STRING);
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asn1_write(data, p, length);
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asn1_pop_tag(data);
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return !data->has_error;
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}
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/* write a LDAP string */
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bool asn1_write_LDAPString(struct asn1_data *data, const char *s)
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{
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asn1_write(data, s, strlen(s));
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return !data->has_error;
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}
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/* write a LDAP string from a DATA_BLOB */
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bool asn1_write_DATA_BLOB_LDAPString(struct asn1_data *data, const DATA_BLOB *s)
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{
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asn1_write(data, s->data, s->length);
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return !data->has_error;
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}
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/* write a general string */
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bool asn1_write_GeneralString(struct asn1_data *data, const char *s)
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{
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asn1_push_tag(data, ASN1_GENERAL_STRING);
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asn1_write_LDAPString(data, s);
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asn1_pop_tag(data);
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return !data->has_error;
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}
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bool asn1_write_ContextSimple(struct asn1_data *data, uint8_t num, DATA_BLOB *blob)
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{
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asn1_push_tag(data, ASN1_CONTEXT_SIMPLE(num));
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asn1_write(data, blob->data, blob->length);
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asn1_pop_tag(data);
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return !data->has_error;
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}
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/* write a BOOLEAN */
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bool asn1_write_BOOLEAN(struct asn1_data *data, bool v)
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{
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asn1_push_tag(data, ASN1_BOOLEAN);
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asn1_write_uint8(data, v ? 0xFF : 0);
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asn1_pop_tag(data);
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return !data->has_error;
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}
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bool asn1_read_BOOLEAN(struct asn1_data *data, bool *v)
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{
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uint8_t tmp = 0;
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asn1_start_tag(data, ASN1_BOOLEAN);
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asn1_read_uint8(data, &tmp);
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if (tmp == 0xFF) {
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*v = true;
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} else {
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*v = false;
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}
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asn1_end_tag(data);
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return !data->has_error;
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}
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/* write a BOOLEAN in a simple context */
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bool asn1_write_BOOLEAN_context(struct asn1_data *data, bool v, int context)
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{
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asn1_push_tag(data, ASN1_CONTEXT_SIMPLE(context));
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asn1_write_uint8(data, v ? 0xFF : 0);
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asn1_pop_tag(data);
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return !data->has_error;
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}
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bool asn1_read_BOOLEAN_context(struct asn1_data *data, bool *v, int context)
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{
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uint8_t tmp = 0;
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asn1_start_tag(data, ASN1_CONTEXT_SIMPLE(context));
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asn1_read_uint8(data, &tmp);
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if (tmp == 0xFF) {
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*v = true;
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} else {
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*v = false;
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}
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asn1_end_tag(data);
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return !data->has_error;
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}
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/* check a BOOLEAN */
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bool asn1_check_BOOLEAN(struct asn1_data *data, bool v)
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{
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uint8_t b = 0;
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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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return false;
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}
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asn1_read_uint8(data, &b);
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if (b != v) {
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data->has_error = true;
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return false;
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}
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return !data->has_error;
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}
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/* load a struct asn1_data structure with a lump of data, ready to be parsed */
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bool asn1_load(struct asn1_data *data, DATA_BLOB blob)
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{
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ZERO_STRUCTP(data);
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data->data = (uint8_t *)talloc_memdup(data, blob.data, blob.length);
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if (!data->data) {
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data->has_error = true;
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return false;
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}
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data->length = blob.length;
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return true;
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}
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/* Peek into an ASN1 buffer, not advancing the pointer */
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bool asn1_peek(struct asn1_data *data, void *p, int len)
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{
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if (data->has_error)
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return false;
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if (len < 0 || data->ofs + len < data->ofs || data->ofs + len < len)
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return false;
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if (data->ofs + len > data->length) {
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/* we need to mark the buffer as consumed, so the caller knows
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this was an out of data error, and not a decode error */
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data->ofs = data->length;
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return false;
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}
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memcpy(p, data->data + data->ofs, len);
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return true;
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}
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/* read from a ASN1 buffer, advancing the buffer pointer */
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bool asn1_read(struct asn1_data *data, void *p, int len)
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{
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if (!asn1_peek(data, p, len)) {
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data->has_error = true;
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return false;
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}
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data->ofs += len;
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return true;
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}
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/* read a uint8_t from a ASN1 buffer */
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bool asn1_read_uint8(struct asn1_data *data, uint8_t *v)
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{
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return asn1_read(data, v, 1);
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}
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bool asn1_peek_uint8(struct asn1_data *data, uint8_t *v)
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{
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return asn1_peek(data, v, 1);
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}
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bool asn1_peek_tag(struct asn1_data *data, uint8_t tag)
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{
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uint8_t b;
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if (asn1_tag_remaining(data) <= 0) {
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return false;
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}
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if (!asn1_peek_uint8(data, &b))
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return false;
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return (b == tag);
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}
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/* start reading a nested asn1 structure */
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bool asn1_start_tag(struct asn1_data *data, uint8_t tag)
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|
{
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* Internal implementation for reading binary OIDs
|
|
* Reading is done as far in the buffer as valid OID
|
|
* till buffer ends or not valid sub-identifier is found.
|
|
*/
|
|
static bool _ber_read_OID_String_impl(TALLOC_CTX *mem_ctx, DATA_BLOB blob,
|
|
const char **OID, size_t *bytes_eaten)
|
|
{
|
|
int i;
|
|
uint8_t *b;
|
|
unsigned int 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 (bytes_eaten)
|
|
*bytes_eaten = i+1;
|
|
}
|
|
if (!tmp_oid) goto nomem;
|
|
}
|
|
|
|
*OID = tmp_oid;
|
|
return true;
|
|
|
|
nomem:
|
|
return false;
|
|
}
|
|
|
|
/* read an object ID from a data blob */
|
|
bool ber_read_OID_String(TALLOC_CTX *mem_ctx, DATA_BLOB blob, const char **OID)
|
|
{
|
|
size_t bytes_eaten;
|
|
|
|
if (!_ber_read_OID_String_impl(mem_ctx, blob, OID, &bytes_eaten))
|
|
return false;
|
|
|
|
return (bytes_eaten == blob.length);
|
|
}
|
|
|
|
/**
|
|
* Deserialize partial OID string.
|
|
* Partial OIDs are in the form:
|
|
* 1:2.5.6:0x81
|
|
* 1:2.5.6:0x8182
|
|
*/
|
|
bool ber_read_partial_OID_String(TALLOC_CTX *mem_ctx, DATA_BLOB blob, const char **partial_oid)
|
|
{
|
|
size_t bytes_left;
|
|
size_t bytes_eaten;
|
|
char *identifier = NULL;
|
|
char *tmp_oid = NULL;
|
|
|
|
if (!_ber_read_OID_String_impl(mem_ctx, blob, (const char **)&tmp_oid, &bytes_eaten))
|
|
return false;
|
|
|
|
if (bytes_eaten < blob.length) {
|
|
bytes_left = blob.length - bytes_eaten;
|
|
identifier = hex_encode_talloc(mem_ctx, &blob.data[bytes_eaten], bytes_left);
|
|
if (!identifier) goto nomem;
|
|
|
|
*partial_oid = talloc_asprintf_append_buffer(tmp_oid, ":0x%s", identifier);
|
|
if (!*partial_oid) goto nomem;
|
|
TALLOC_FREE(identifier);
|
|
} else {
|
|
*partial_oid = tmp_oid;
|
|
}
|
|
|
|
return true;
|
|
|
|
nomem:
|
|
TALLOC_FREE(identifier);
|
|
TALLOC_FREE(tmp_oid);
|
|
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;
|
|
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 a BIT STRING */
|
|
bool asn1_read_BitString(struct asn1_data *data, TALLOC_CTX *mem_ctx, DATA_BLOB *blob, uint8_t *padding)
|
|
{
|
|
int len;
|
|
ZERO_STRUCTP(blob);
|
|
if (!asn1_start_tag(data, ASN1_BIT_STRING)) return false;
|
|
len = asn1_tag_remaining(data);
|
|
if (len < 0) {
|
|
data->has_error = true;
|
|
return false;
|
|
}
|
|
if (!asn1_read_uint8(data, padding)) return false;
|
|
|
|
*blob = data_blob_talloc(mem_ctx, NULL, len);
|
|
if (!blob->data) {
|
|
data->has_error = true;
|
|
return false;
|
|
}
|
|
if (asn1_read(data, blob->data, len - 1)) {
|
|
blob->length--;
|
|
blob->data[len] = 0;
|
|
asn1_end_tag(data);
|
|
}
|
|
|
|
if (data->has_error) {
|
|
data_blob_free(blob);
|
|
*blob = data_blob_null;
|
|
*padding = 0;
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/*
|
|
Get us the data just written without copying
|
|
*/
|
|
bool asn1_blob(const struct asn1_data *asn1, DATA_BLOB *blob)
|
|
{
|
|
if (asn1->has_error) {
|
|
return false;
|
|
}
|
|
if (asn1->nesting != NULL) {
|
|
return false;
|
|
}
|
|
blob->data = asn1->data;
|
|
blob->length = asn1->length;
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
Fill in an asn1 struct without making a copy
|
|
*/
|
|
void asn1_load_nocopy(struct asn1_data *data, uint8_t *buf, size_t len)
|
|
{
|
|
ZERO_STRUCTP(data);
|
|
data->data = buf;
|
|
data->length = len;
|
|
}
|
|
|
|
/*
|
|
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;
|
|
}
|