s3:rpc handles are used by all pipes, use better name

1 files changed, 400 insertions, 0 deletions

diff --git a/source3/rpc_server/rpc_handles.c b/source3/rpc_server/rpc_handles.c
new file mode 100644
index 0000000000..7cc1b43611
--- /dev/null
+++ b/source3/rpc_server/rpc_handles.c
@@ -0,0 +1,400 @@
+/* 
+ *  Unix SMB/CIFS implementation.
+ *  RPC Pipe client / server routines
+ *  Copyright (C) Andrew Tridgell              1992-1997,
+ *  Copyright (C) Luke Kenneth Casson Leighton 1996-1997,
+ *  Copyright (C) Jeremy Allison			   2001.
+ *  
+ *  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 "../librpc/gen_ndr/ndr_lsa.h"
+#include "../librpc/gen_ndr/ndr_samr.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_RPC_SRV
+
+/*
+ * Handle database - stored per pipe.
+ */
+
+struct policy {
+	struct policy *next, *prev;
+
+	struct policy_handle pol_hnd;
+
+	uint32_t access_granted;
+
+	void *data_ptr;
+};
+
+struct handle_list {
+	struct policy *Policy; 	/* List of policies. */
+	size_t count;			/* Current number of handles. */
+	size_t pipe_ref_count;	/* Number of pipe handles referring to this list. */
+};
+
+/* This is the max handles across all instances of a pipe name. */
+#ifndef MAX_OPEN_POLS
+#define MAX_OPEN_POLS 2048
+#endif
+
+/****************************************************************************
+ Hack as handles need to be persisant over lsa pipe closes so long as a samr
+ pipe is open. JRA.
+****************************************************************************/
+
+static bool is_samr_lsa_pipe(const struct ndr_syntax_id *syntax)
+{
+	return (ndr_syntax_id_equal(syntax, &ndr_table_samr.syntax_id)
+		|| ndr_syntax_id_equal(syntax, &ndr_table_lsarpc.syntax_id));
+}
+
+size_t num_pipe_handles(struct handle_list *list)
+{
+	if (list == NULL) {
+		return 0;
+	}
+	return list->count;
+}
+
+/****************************************************************************
+ Initialise a policy handle list on a pipe. Handle list is shared between all
+ pipes of the same name.
+****************************************************************************/
+
+bool init_pipe_handle_list(pipes_struct *p, const struct ndr_syntax_id *syntax)
+{
+	pipes_struct *plist;
+	struct handle_list *hl;
+
+	for (plist = get_first_internal_pipe();
+	     plist;
+	     plist = get_next_internal_pipe(plist)) {
+		if (ndr_syntax_id_equal(syntax, &plist->syntax)) {
+			break;
+		}
+		if (is_samr_lsa_pipe(&plist->syntax)
+		    && is_samr_lsa_pipe(syntax)) {
+			/*
+			 * samr and lsa share a handle space (same process
+			 * under Windows?)
+			 */
+			break;
+		}
+	}
+
+	if (plist != NULL) {
+		hl = plist->pipe_handles;
+		if (hl == NULL) {
+			return false;
+		}
+	} else {
+		/*
+		 * First open, we have to create the handle list
+		 */
+		hl = SMB_MALLOC_P(struct handle_list);
+		if (hl == NULL) {
+			return false;
+		}
+		ZERO_STRUCTP(hl);
+
+		DEBUG(10,("init_pipe_handle_list: created handle list for "
+			  "pipe %s\n",
+			  get_pipe_name_from_syntax(talloc_tos(), syntax)));
+	}
+
+	/*
+	 * One more pipe is using this list.
+	 */
+
+	hl->pipe_ref_count++;
+
+	/*
+	 * Point this pipe at this list.
+	 */
+
+	p->pipe_handles = hl;
+
+	DEBUG(10,("init_pipe_handle_list: pipe_handles ref count = %lu for "
+		  "pipe %s\n", (unsigned long)p->pipe_handles->pipe_ref_count,
+		  get_pipe_name_from_syntax(talloc_tos(), syntax)));
+
+	return True;
+}
+
+/****************************************************************************
+  find first available policy slot.  creates a policy handle for you.
+
+  If "data_ptr" is given, this must be a talloc'ed object, create_policy_hnd
+  talloc_moves this into the handle. If the policy_hnd is closed,
+  data_ptr is TALLOC_FREE()'ed
+****************************************************************************/
+
+static struct policy *create_policy_hnd_internal(pipes_struct *p,
+						 struct policy_handle *hnd,
+						 void *data_ptr)
+{
+	static uint32 pol_hnd_low  = 0;
+	static uint32 pol_hnd_high = 0;
+	time_t t = time(NULL);
+
+	struct policy *pol;
+
+	if (p->pipe_handles->count > MAX_OPEN_POLS) {
+		DEBUG(0,("create_policy_hnd: ERROR: too many handles (%d) on this pipe.\n",
+				(int)p->pipe_handles->count));
+		return NULL;
+	}
+
+	pol = TALLOC_ZERO_P(NULL, struct policy);
+	if (!pol) {
+		DEBUG(0,("create_policy_hnd: ERROR: out of memory!\n"));
+		return NULL;
+	}
+
+	if (data_ptr != NULL) {
+		pol->data_ptr = talloc_move(pol, &data_ptr);
+	}
+
+	pol_hnd_low++;
+	if (pol_hnd_low == 0)
+		(pol_hnd_high)++;
+
+	SIVAL(&pol->pol_hnd.handle_type, 0 , 0);  /* first bit must be null */
+	SIVAL(&pol->pol_hnd.uuid.time_low, 0 , pol_hnd_low ); /* second bit is incrementing */
+	SSVAL(&pol->pol_hnd.uuid.time_mid, 0 , pol_hnd_high); /* second bit is incrementing */
+	SSVAL(&pol->pol_hnd.uuid.time_hi_and_version, 0 , (pol_hnd_high>>16)); /* second bit is incrementing */
+
+	/* split the current time into two 16 bit values */
+
+	SSVAL(pol->pol_hnd.uuid.clock_seq, 0, (t>>16)); /* something random */
+	SSVAL(pol->pol_hnd.uuid.node, 0, t); /* something random */
+
+	SIVAL(pol->pol_hnd.uuid.node, 2, sys_getpid()); /* something more random */
+
+	DLIST_ADD(p->pipe_handles->Policy, pol);
+	p->pipe_handles->count++;
+
+	*hnd = pol->pol_hnd;
+	
+	DEBUG(4,("Opened policy hnd[%d] ", (int)p->pipe_handles->count));
+	dump_data(4, (uint8 *)hnd, sizeof(*hnd));
+
+	return pol;
+}
+
+bool create_policy_hnd(pipes_struct *p, struct policy_handle *hnd,
+		       void *data_ptr)
+{
+	return create_policy_hnd_internal(p, hnd, data_ptr) != NULL;
+}
+
+/****************************************************************************
+  find policy by handle - internal version.
+****************************************************************************/
+
+static struct policy *find_policy_by_hnd_internal(pipes_struct *p,
+						  const struct policy_handle *hnd,
+						  void **data_p)
+{
+	struct policy *pol;
+	size_t i;
+
+	if (data_p)
+		*data_p = NULL;
+
+	for (i = 0, pol=p->pipe_handles->Policy;pol;pol=pol->next, i++) {
+		if (memcmp(&pol->pol_hnd, hnd, sizeof(*hnd)) == 0) {
+			DEBUG(4,("Found policy hnd[%d] ", (int)i));
+			dump_data(4, (uint8 *)hnd, sizeof(*hnd));
+			if (data_p)
+				*data_p = pol->data_ptr;
+			return pol;
+		}
+	}
+
+	DEBUG(4,("Policy not found: "));
+	dump_data(4, (uint8 *)hnd, sizeof(*hnd));
+
+	p->bad_handle_fault_state = True;
+
+	return NULL;
+}
+
+/****************************************************************************
+  find policy by handle
+****************************************************************************/
+
+bool find_policy_by_hnd(pipes_struct *p, const struct policy_handle *hnd,
+			void **data_p)
+{
+	return find_policy_by_hnd_internal(p, hnd, data_p) == NULL ? False : True;
+}
+
+/****************************************************************************
+  Close a policy.
+****************************************************************************/
+
+bool close_policy_hnd(pipes_struct *p, struct policy_handle *hnd)
+{
+	struct policy *pol = find_policy_by_hnd_internal(p, hnd, NULL);
+
+	if (!pol) {
+		DEBUG(3,("Error closing policy\n"));
+		return False;
+	}
+
+	DEBUG(3,("Closed policy\n"));
+
+	p->pipe_handles->count--;
+
+	DLIST_REMOVE(p->pipe_handles->Policy, pol);
+
+	TALLOC_FREE(pol);
+
+	return True;
+}
+
+/****************************************************************************
+ Close a pipe - free the handle list if it was the last pipe reference.
+****************************************************************************/
+
+void close_policy_by_pipe(pipes_struct *p)
+{
+	p->pipe_handles->pipe_ref_count--;
+
+	if (p->pipe_handles->pipe_ref_count == 0) {
+		/*
+		 * Last pipe open on this list - free the list.
+		 */
+		while (p->pipe_handles->Policy)
+			close_policy_hnd(p, &p->pipe_handles->Policy->pol_hnd);
+
+		p->pipe_handles->Policy = NULL;
+		p->pipe_handles->count = 0;
+
+		SAFE_FREE(p->pipe_handles);
+		DEBUG(10,("close_policy_by_pipe: deleted handle list for "
+			  "pipe %s\n",
+			  get_pipe_name_from_syntax(talloc_tos(), &p->syntax)));
+	}
+}
+
+/*******************************************************************
+Shall we allow access to this rpc?  Currently this function
+implements the 'restrict anonymous' setting by denying access to
+anonymous users if the restrict anonymous level is > 0.  Further work
+will be checking a security descriptor to determine whether a user
+token has enough access to access the pipe.
+********************************************************************/
+
+bool pipe_access_check(pipes_struct *p)
+{
+	/* Don't let anonymous users access this RPC if restrict
+	   anonymous > 0 */
+
+	if (lp_restrict_anonymous() > 0) {
+
+		/* schannel, so we must be ok */
+		if (p->pipe_bound && (p->auth.auth_type == PIPE_AUTH_TYPE_SCHANNEL)) {
+			return True;
+		}
+
+		if (p->server_info->guest) {
+			return False;
+		}
+	}
+
+	return True;
+}
+
+void *_policy_handle_create(struct pipes_struct *p, struct policy_handle *hnd,
+			    uint32_t access_granted, size_t data_size,
+			    const char *type, NTSTATUS *pstatus)
+{
+	struct policy *pol;
+	void *data;
+
+	if (p->pipe_handles->count > MAX_OPEN_POLS) {
+		DEBUG(0, ("policy_handle_create: ERROR: too many handles (%d) "
+			  "on pipe %s.\n", (int)p->pipe_handles->count,
+			  get_pipe_name_from_syntax(talloc_tos(), &p->syntax)));
+		*pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
+		return NULL;
+	}
+
+	data = talloc_size(talloc_tos(), data_size);
+	if (data == NULL) {
+		*pstatus = NT_STATUS_NO_MEMORY;
+		return NULL;
+	}
+	talloc_set_name_const(data, type);
+
+	pol = create_policy_hnd_internal(p, hnd, data);
+	if (pol == NULL) {
+		TALLOC_FREE(data);
+		*pstatus = NT_STATUS_NO_MEMORY;
+		return NULL;
+	}
+	pol->access_granted = access_granted;
+	*pstatus = NT_STATUS_OK;
+	return data;
+}
+
+void *_policy_handle_find(struct pipes_struct *p,
+			  const struct policy_handle *hnd,
+			  uint32_t access_required,
+			  uint32_t *paccess_granted,
+			  const char *name, const char *location,
+			  NTSTATUS *pstatus)
+{
+	struct policy *pol;
+	void *data;
+
+	pol = find_policy_by_hnd_internal(p, hnd, &data);
+	if (pol == NULL) {
+		*pstatus = NT_STATUS_INVALID_HANDLE;
+		return NULL;
+	}
+	if (strcmp(name, talloc_get_name(data)) != 0) {
+		DEBUG(10, ("expected %s, got %s\n", name,
+			   talloc_get_name(data)));
+		*pstatus = NT_STATUS_INVALID_HANDLE;
+		return NULL;
+	}
+	if ((access_required & pol->access_granted) != access_required) {
+		if (geteuid() == sec_initial_uid()) {
+			DEBUG(4, ("%s: ACCESS should be DENIED (granted: "
+				  "%#010x; required: %#010x)\n", location,
+				  pol->access_granted, access_required));
+			DEBUGADD(4,("but overwritten by euid == 0\n"));
+			goto okay;
+		}
+		DEBUG(2,("%s: ACCESS DENIED (granted: %#010x; required: "
+			 "%#010x)\n", location, pol->access_granted,
+			 access_required));
+		*pstatus = NT_STATUS_ACCESS_DENIED;
+		return NULL;
+	}
+
+ okay:
+	DEBUG(10, ("found handle of type %s\n", talloc_get_name(data)));
+	if (paccess_granted != NULL) {
+		*paccess_granted = pol->access_granted;
+	}
+	*pstatus = NT_STATUS_OK;
+	return data;
+}