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-rw-r--r--source4/librpc/ndr/ndr_basic.c301
1 files changed, 301 insertions, 0 deletions
diff --git a/source4/librpc/ndr/ndr_basic.c b/source4/librpc/ndr/ndr_basic.c
index 5d4ade096f..1adf6ea1d3 100644
--- a/source4/librpc/ndr/ndr_basic.c
+++ b/source4/librpc/ndr/ndr_basic.c
@@ -972,3 +972,304 @@ NTSTATUS ndr_pull_DATA_BLOB(struct ndr_pull *ndr, DATA_BLOB *blob)
ndr->offset += length;
return NT_STATUS_OK;
}
+
+/*
+ this is a tiny ndr packet generator. This
+ generator is not general enough for all our rpc needs, its just
+ enough for the 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
+ */
+NTSTATUS ndr_push_format_blob(DATA_BLOB *blob, TALLOC_CTX *mem_ctx,
+ const char *format, ...)
+{
+ int i, n;
+ va_list ap;
+ char *s;
+ uint8_t *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_t *);
+ head_size += 8;
+ data_size += va_arg(ap, int);
+ break;
+ case 'b':
+ b = va_arg(ap, uint8_t *);
+ 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_talloc(mem_ctx, NULL, head_size + data_size);
+
+ if (blob->length != (head_size + data_size)) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ 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_t *);
+ 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_t *);
+ 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 NT_STATUS_OK;
+}
+
+
+/* a helpful macro to avoid running over the end of our blob */
+#define NEED_DATA(amount) \
+if ((head_ofs + amount) > blob->length) { \
+ return NT_STATUS_INVALID_PARAMETER; \
+}
+
+/*
+ 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
+ */
+
+NTSTATUS ndr_pull_format_blob(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx,
+ 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;
+ 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 = "";
+ } else {
+ /* make sure its in the right format - be strict */
+ if ((len1 != len2) || (ptr + len1 < ptr) || (ptr + len1 < len1) || (ptr + len1 > blob->length)) {
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+ if (len1 & 1) {
+ /* if odd length and unicode */
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+ if (blob->data + ptr < (uint8_t *)ptr || blob->data + ptr < blob->data)
+ return NT_STATUS_INVALID_PARAMETER;
+
+ if (0 < len1) {
+ pull_string(NULL, p, blob->data + ptr, sizeof(p),
+ len1,
+ STR_UNICODE|STR_NOALIGN);
+ (*ps) = talloc_strdup(mem_ctx, p);
+ if (!(*ps)) {
+ return NT_STATUS_NO_MEMORY;
+ }
+ } 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 = 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)) {
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ if (blob->data + ptr < (uint8_t *)ptr || blob->data + ptr < blob->data)
+ return NT_STATUS_INVALID_PARAMETER;
+
+ if (0 < len1) {
+ pull_string(NULL, p, blob->data + ptr, sizeof(p),
+ len1,
+ STR_ASCII|STR_NOALIGN);
+ (*ps) = talloc_strdup(mem_ctx, p);
+ if (!(*ps)) {
+ return NT_STATUS_NO_MEMORY;
+ }
+ } 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)) {
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ if (blob->data + ptr < (uint8_t *)ptr || blob->data + ptr < blob->data)
+ return NT_STATUS_INVALID_PARAMETER;
+
+ *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)
+ return NT_STATUS_INVALID_PARAMETER;
+
+ *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)
+ return NT_STATUS_INVALID_PARAMETER;
+
+ 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 NT_STATUS_INVALID_PARAMETER;
+ }
+ break;
+ }
+ }
+ va_end(ap);
+
+ return NT_STATUS_OK;
+}
generated by cgit (git 2.34.1) at 2024-11-10 16:19:16 +0000