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-rw-r--r--libcli/auth/msrpc_parse.c368
1 files changed, 368 insertions, 0 deletions
diff --git a/libcli/auth/msrpc_parse.c b/libcli/auth/msrpc_parse.c
new file mode 100644
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--- /dev/null
+++ b/libcli/auth/msrpc_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 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 "auth/ntlmssp/msrpc_parse.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(TALLOC_CTX *mem_ctx,
+ DATA_BLOB *blob,
+ const char *format, ...)
+{
+ int i, j;
+ bool ret;
+ va_list ap;
+ char *s;
+ uint8_t *b;
+ int head_size=0, data_size=0;
+ int head_ofs, data_ofs;
+ int *intargs;
+ size_t n;
+
+ DATA_BLOB *pointers;
+
+ pointers = talloc_array(mem_ctx, DATA_BLOB, strlen(format));
+ intargs = talloc_array(pointers, int, strlen(format));
+
+ /* 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;
+ ret = push_ucs2_talloc(pointers, (smb_ucs2_t **)&pointers[i].data,
+ s, &n);
+ if (!ret) {
+ return false;
+ }
+ pointers[i].length = n;
+ pointers[i].length -= 2;
+ data_size += pointers[i].length;
+ break;
+ case 'A':
+ s = va_arg(ap, char *);
+ head_size += 8;
+ ret = push_ascii_talloc(pointers, (char **)&pointers[i].data, s,
+ &n);
+ if (!ret) {
+ return false;
+ }
+ pointers[i].length = n;
+ pointers[i].length -= 1;
+ data_size += pointers[i].length;
+ break;
+ case 'a':
+ j = va_arg(ap, int);
+ intargs[i] = j;
+ s = va_arg(ap, char *);
+ ret = push_ucs2_talloc(pointers, (smb_ucs2_t **)&pointers[i].data,
+ s, &n);
+ if (!ret) {
+ return false;
+ }
+ pointers[i].length = n;
+ pointers[i].length -= 2;
+ data_size += pointers[i].length + 4;
+ break;
+ case 'B':
+ b = va_arg(ap, uint8_t *);
+ head_size += 8;
+ pointers[i].data = b;
+ pointers[i].length = va_arg(ap, int);
+ data_size += pointers[i].length;
+ break;
+ case 'b':
+ b = va_arg(ap, uint8_t *);
+ pointers[i].data = b;
+ pointers[i].length = va_arg(ap, int);
+ head_size += pointers[i].length;
+ break;
+ case 'd':
+ j = va_arg(ap, int);
+ intargs[i] = j;
+ head_size += 4;
+ break;
+ case 'C':
+ s = va_arg(ap, char *);
+ pointers[i].data = (uint8_t *)s;
+ pointers[i].length = strlen(s)+1;
+ head_size += pointers[i].length;
+ break;
+ }
+ }
+ va_end(ap);
+
+ /* allocate the space, then scan the format again to fill in the values */
+ *blob = data_blob_talloc(mem_ctx, 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':
+ case 'A':
+ case 'B':
+ n = pointers[i].length;
+ 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 (pointers[i].data && n) /* don't follow null pointers... */
+ memcpy(blob->data+data_ofs, pointers[i].data, n);
+ data_ofs += n;
+ break;
+ case 'a':
+ j = intargs[i];
+ SSVAL(blob->data, data_ofs, j); data_ofs += 2;
+
+ n = pointers[i].length;
+ SSVAL(blob->data, data_ofs, n); data_ofs += 2;
+ if (n >= 0) {
+ memcpy(blob->data+data_ofs, pointers[i].data, n);
+ }
+ data_ofs += n;
+ break;
+ case 'd':
+ j = intargs[i];
+ SIVAL(blob->data, head_ofs, j);
+ head_ofs += 4;
+ break;
+ case 'b':
+ n = pointers[i].length;
+ memcpy(blob->data + head_ofs, pointers[i].data, n);
+ head_ofs += n;
+ break;
+ case 'C':
+ n = pointers[i].length;
+ memcpy(blob->data + head_ofs, pointers[i].data, n);
+ head_ofs += n;
+ break;
+ }
+ }
+ va_end(ap);
+
+ talloc_free(pointers);
+
+ 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(TALLOC_CTX *mem_ctx,
+ const DATA_BLOB *blob,
+ const char *format, ...)
+{
+ int i;
+ va_list ap;
+ const char **ps, *s;
+ DATA_BLOB *b;
+ size_t head_ofs = 0;
+ uint16_t len1, len2;
+ uint32_t ptr;
+ uint32_t *v;
+ size_t p_len = 1024;
+ char *p = talloc_array(mem_ctx, char, p_len);
+ bool ret = true;
+
+ 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 = (const char **)va_arg(ap, char **);
+ if (len1 == 0 && len2 == 0) {
+ *ps = "";
+ } else {
+ /* make sure its in the right format - be strict */
+ if ((len1 != len2) || (ptr + len1 < ptr) || (ptr + len1 < len1) || (ptr + len1 > blob->length)) {
+ ret = false;
+ goto cleanup;
+ }
+ if (len1 & 1) {
+ /* if odd length and unicode */
+ ret = false;
+ goto cleanup;
+ }
+ if (blob->data + ptr < (uint8_t *)(uintptr_t)ptr ||
+ blob->data + ptr < blob->data) {
+ ret = false;
+ goto cleanup;
+ }
+
+ if (0 < len1) {
+ pull_string(p, blob->data + ptr, p_len,
+ len1, STR_UNICODE|STR_NOALIGN);
+ (*ps) = talloc_strdup(mem_ctx, p);
+ if (!(*ps)) {
+ ret = false;
+ goto cleanup;
+ }
+ } else {
+ (*ps) = "";
+ }
+ }
+ 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 = (const char **)va_arg(ap, char **);
+ /* make sure its in the right format - be strict */
+ if (len1 == 0 && len2 == 0) {
+ *ps = "";
+ } else {
+ if ((len1 != len2) || (ptr + len1 < ptr) || (ptr + len1 < len1) || (ptr + len1 > blob->length)) {
+ ret = false;
+ goto cleanup;
+ }
+
+ if (blob->data + ptr < (uint8_t *)(uintptr_t)ptr ||
+ blob->data + ptr < blob->data) {
+ ret = false;
+ goto cleanup;
+ }
+
+ if (0 < len1) {
+ pull_string(p, blob->data + ptr, p_len,
+ len1, STR_ASCII|STR_NOALIGN);
+ (*ps) = talloc_strdup(mem_ctx, p);
+ if (!(*ps)) {
+ ret = false;
+ goto cleanup;
+ }
+ } else {
+ (*ps) = "";
+ }
+ }
+ 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_talloc(mem_ctx, 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)) {
+ ret = false;
+ goto cleanup;
+ }
+
+ if (blob->data + ptr < (uint8_t *)(uintptr_t)ptr ||
+ blob->data + ptr < blob->data) {
+ ret = false;
+ goto cleanup;
+ }
+
+ *b = data_blob_talloc(mem_ctx, blob->data + ptr, len1);
+ }
+ break;
+ case 'b':
+ b = (DATA_BLOB *)va_arg(ap, void *);
+ len1 = va_arg(ap, uint_t);
+ /* make sure its in the right format - be strict */
+ NEED_DATA(len1);
+ if (blob->data + head_ofs < (uint8_t *)head_ofs ||
+ blob->data + head_ofs < blob->data) {
+ ret = false;
+ goto cleanup;
+ }
+
+ *b = data_blob_talloc(mem_ctx, blob->data + head_ofs, len1);
+ head_ofs += len1;
+ break;
+ case 'd':
+ v = va_arg(ap, uint32_t *);
+ NEED_DATA(4);
+ *v = IVAL(blob->data, head_ofs); head_ofs += 4;
+ break;
+ case 'C':
+ s = va_arg(ap, char *);
+
+ if (blob->data + head_ofs < (uint8_t *)head_ofs ||
+ blob->data + head_ofs < blob->data) {
+ ret = false;
+ goto cleanup;
+ }
+
+ head_ofs += pull_string(p,
+ blob->data+head_ofs, p_len,
+ blob->length - head_ofs,
+ STR_ASCII|STR_TERMINATE);
+ if (strcmp(s, p) != 0) {
+ ret = false;
+ goto cleanup;
+ }
+ break;
+ }
+ }
+
+cleanup:
+ va_end(ap);
+ talloc_free(p);
+ return ret;
+}
generated by cgit (git 2.34.1) at 2024-11-05 21:31:17 +0000