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-rw-r--r--source4/libcli/auth/ntlmssp_parse.c299
1 files changed, 299 insertions, 0 deletions
diff --git a/source4/libcli/auth/ntlmssp_parse.c b/source4/libcli/auth/ntlmssp_parse.c
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+++ b/source4/libcli/auth/ntlmssp_parse.c
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+/*
+ Unix SMB/CIFS implementation.
+ simple kerberos5/SPNEGO routines
+ Copyright (C) Andrew Tridgell 2001
+ Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2002
+ Copyright (C) Andrew Bartlett 2002-2003
+
+ 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"
+
+/*
+ this is a tiny msrpc packet generator. I am only using this to
+ avoid tying this code to a particular varient of our rpc code. This
+ generator is not general enough for all our rpc needs, its just
+ enough for the spnego/ntlmssp code
+
+ format specifiers are:
+
+ U = unicode string (input is unix string)
+ a = address (input is char *unix_string)
+ (1 byte type, 1 byte length, unicode/ASCII string, all inline)
+ A = ASCII string (input is unix string)
+ B = data blob (pointer + length)
+ b = data blob in header (pointer + length)
+ D
+ d = word (4 bytes)
+ C = constant ascii string
+ */
+BOOL msrpc_gen(DATA_BLOB *blob,
+ const char *format, ...)
+{
+ int i, n;
+ va_list ap;
+ char *s;
+ uint8 *b;
+ int head_size=0, data_size=0;
+ int head_ofs, data_ofs;
+
+ /* first scan the format to work out the header and body size */
+ va_start(ap, format);
+ for (i=0; format[i]; i++) {
+ switch (format[i]) {
+ case 'U':
+ s = va_arg(ap, char *);
+ head_size += 8;
+ data_size += str_charnum(s) * 2;
+ break;
+ case 'A':
+ s = va_arg(ap, char *);
+ head_size += 8;
+ data_size += str_ascii_charnum(s);
+ break;
+ case 'a':
+ n = va_arg(ap, int);
+ s = va_arg(ap, char *);
+ data_size += (str_charnum(s) * 2) + 4;
+ break;
+ case 'B':
+ b = va_arg(ap, uint8 *);
+ head_size += 8;
+ data_size += va_arg(ap, int);
+ break;
+ case 'b':
+ b = va_arg(ap, uint8 *);
+ head_size += va_arg(ap, int);
+ break;
+ case 'd':
+ n = va_arg(ap, int);
+ head_size += 4;
+ break;
+ case 'C':
+ s = va_arg(ap, char *);
+ head_size += str_charnum(s) + 1;
+ break;
+ }
+ }
+ va_end(ap);
+
+ /* allocate the space, then scan the format again to fill in the values */
+ *blob = data_blob(NULL, head_size + data_size);
+
+ head_ofs = 0;
+ data_ofs = head_size;
+
+ va_start(ap, format);
+ for (i=0; format[i]; i++) {
+ switch (format[i]) {
+ case 'U':
+ s = va_arg(ap, char *);
+ n = str_charnum(s);
+ SSVAL(blob->data, head_ofs, n*2); head_ofs += 2;
+ SSVAL(blob->data, head_ofs, n*2); head_ofs += 2;
+ SIVAL(blob->data, head_ofs, data_ofs); head_ofs += 4;
+ push_string(NULL, blob->data+data_ofs, s, n*2, STR_UNICODE|STR_NOALIGN);
+ data_ofs += n*2;
+ break;
+ case 'A':
+ s = va_arg(ap, char *);
+ n = str_ascii_charnum(s);
+ SSVAL(blob->data, head_ofs, n); head_ofs += 2;
+ SSVAL(blob->data, head_ofs, n); head_ofs += 2;
+ SIVAL(blob->data, head_ofs, data_ofs); head_ofs += 4;
+ push_string(NULL, blob->data+data_ofs, s, n, STR_ASCII|STR_NOALIGN);
+ data_ofs += n;
+ break;
+ case 'a':
+ n = va_arg(ap, int);
+ SSVAL(blob->data, data_ofs, n); data_ofs += 2;
+ s = va_arg(ap, char *);
+ n = str_charnum(s);
+ SSVAL(blob->data, data_ofs, n*2); data_ofs += 2;
+ if (0 < n) {
+ push_string(NULL, blob->data+data_ofs, s, n*2,
+ STR_UNICODE|STR_NOALIGN);
+ }
+ data_ofs += n*2;
+ break;
+
+ case 'B':
+ b = va_arg(ap, uint8 *);
+ n = va_arg(ap, int);
+ SSVAL(blob->data, head_ofs, n); head_ofs += 2;
+ SSVAL(blob->data, head_ofs, n); head_ofs += 2;
+ SIVAL(blob->data, head_ofs, data_ofs); head_ofs += 4;
+ if (n && b) /* don't follow null pointers... */
+ memcpy(blob->data+data_ofs, b, n);
+ data_ofs += n;
+ break;
+ case 'd':
+ n = va_arg(ap, int);
+ SIVAL(blob->data, head_ofs, n); head_ofs += 4;
+ break;
+ case 'b':
+ b = va_arg(ap, uint8 *);
+ n = va_arg(ap, int);
+ memcpy(blob->data + head_ofs, b, n);
+ head_ofs += n;
+ break;
+ case 'C':
+ s = va_arg(ap, char *);
+ head_ofs += push_string(NULL, blob->data+head_ofs, s, -1,
+ STR_ASCII|STR_TERMINATE);
+ break;
+ }
+ }
+ va_end(ap);
+
+ return True;
+}
+
+
+/* a helpful macro to avoid running over the end of our blob */
+#define NEED_DATA(amount) \
+if ((head_ofs + amount) > blob->length) { \
+ return False; \
+}
+
+/*
+ this is a tiny msrpc packet parser. This the the partner of msrpc_gen
+
+ format specifiers are:
+
+ U = unicode string (output is unix string)
+ A = ascii string
+ B = data blob
+ b = data blob in header
+ d = word (4 bytes)
+ C = constant ascii string
+ */
+
+BOOL msrpc_parse(const DATA_BLOB *blob,
+ const char *format, ...)
+{
+ int i;
+ va_list ap;
+ char **ps, *s;
+ DATA_BLOB *b;
+ size_t head_ofs = 0;
+ uint16 len1, len2;
+ uint32 ptr;
+ uint32 *v;
+ pstring p;
+
+ va_start(ap, format);
+ for (i=0; format[i]; i++) {
+ switch (format[i]) {
+ case 'U':
+ NEED_DATA(8);
+ len1 = SVAL(blob->data, head_ofs); head_ofs += 2;
+ len2 = SVAL(blob->data, head_ofs); head_ofs += 2;
+ ptr = IVAL(blob->data, head_ofs); head_ofs += 4;
+
+ ps = va_arg(ap, char **);
+ if (len1 == 0 && len2 == 0) {
+ *ps = smb_xstrdup("");
+ } else {
+ /* make sure its in the right format - be strict */
+ if ((len1 != len2) || (ptr + len1 < ptr) || (ptr + len1 < len1) || (ptr + len1 > blob->length)) {
+ return False;
+ }
+ if (len1 & 1) {
+ /* if odd length and unicode */
+ return False;
+ }
+
+ if (0 < len1) {
+ pull_string(NULL, p, blob->data + ptr, sizeof(p),
+ len1,
+ STR_UNICODE|STR_NOALIGN);
+ (*ps) = smb_xstrdup(p);
+ } else {
+ (*ps) = smb_xstrdup("");
+ }
+ }
+ break;
+ case 'A':
+ NEED_DATA(8);
+ len1 = SVAL(blob->data, head_ofs); head_ofs += 2;
+ len2 = SVAL(blob->data, head_ofs); head_ofs += 2;
+ ptr = IVAL(blob->data, head_ofs); head_ofs += 4;
+
+ ps = va_arg(ap, char **);
+ /* make sure its in the right format - be strict */
+ if (len1 == 0 && len2 == 0) {
+ *ps = smb_xstrdup("");
+ } else {
+ if ((len1 != len2) || (ptr + len1 < ptr) || (ptr + len1 < len1) || (ptr + len1 > blob->length)) {
+ return False;
+ }
+
+ if (0 < len1) {
+ pull_string(NULL, p, blob->data + ptr, sizeof(p),
+ len1,
+ STR_ASCII|STR_NOALIGN);
+ (*ps) = smb_xstrdup(p);
+ } else {
+ (*ps) = smb_xstrdup("");
+ }
+ }
+ break;
+ case 'B':
+ NEED_DATA(8);
+ len1 = SVAL(blob->data, head_ofs); head_ofs += 2;
+ len2 = SVAL(blob->data, head_ofs); head_ofs += 2;
+ ptr = IVAL(blob->data, head_ofs); head_ofs += 4;
+
+ b = (DATA_BLOB *)va_arg(ap, void *);
+ if (len1 == 0 && len2 == 0) {
+ *b = data_blob(NULL, 0);
+ } else {
+ /* make sure its in the right format - be strict */
+ if ((len1 != len2) || (ptr + len1 < ptr) || (ptr + len1 < len1) || (ptr + len1 > blob->length)) {
+ return False;
+ }
+ *b = data_blob(blob->data + ptr, len1);
+ }
+ break;
+ case 'b':
+ b = (DATA_BLOB *)va_arg(ap, void *);
+ len1 = va_arg(ap, unsigned);
+ /* make sure its in the right format - be strict */
+ NEED_DATA(len1);
+ *b = data_blob(blob->data + head_ofs, len1);
+ head_ofs += len1;
+ break;
+ case 'd':
+ v = va_arg(ap, uint32 *);
+ NEED_DATA(4);
+ *v = IVAL(blob->data, head_ofs); head_ofs += 4;
+ break;
+ case 'C':
+ s = va_arg(ap, char *);
+ head_ofs += pull_string(NULL, p, blob->data+head_ofs, sizeof(p),
+ blob->length - head_ofs,
+ STR_ASCII|STR_TERMINATE);
+ if (strcmp(s, p) != 0) {
+ return False;
+ }
+ break;
+ }
+ }
+ va_end(ap);
+
+ return True;
+}
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