Fix bug 327 (again and I think for the last time). Make sure that

pam_smbpass.so will load ok.  Had to move some functions around to work
around dependency problems (hence the new passdb/lookup_sid.c)

Also make sure that libsmbclient.a is built and installed when
we support shared libraries.
(This used to be commit 780055f4422f11fb0524ac1f003cdc5f317f8b19)

1 files changed, 488 insertions, 0 deletions

diff --git a/source3/passdb/lookup_sid.c b/source3/passdb/lookup_sid.c
new file mode 100644
index 0000000000..f84ff28db9
--- /dev/null
+++ b/source3/passdb/lookup_sid.c
@@ -0,0 +1,488 @@
+/* 
+   Unix SMB/CIFS implementation.
+   uid/user handling
+   Copyright (C) Andrew Tridgell         1992-1998
+   Copyright (C) Gerald (Jerry) Carter   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"
+
+/*****************************************************************
+ *THE CANONICAL* convert name to SID function.
+ Tries local lookup first - for local domains - then uses winbind.
+*****************************************************************/  
+
+BOOL lookup_name(const char *domain, const char *name, DOM_SID *psid, enum SID_NAME_USE *name_type)
+{
+	fstring sid;
+	BOOL local_lookup = False;
+	
+	*name_type = SID_NAME_UNKNOWN;
+
+	/* If we are looking up a domain user, make sure it is
+	   for the local machine only */
+	
+	if (strequal(global_myname(), domain)) {
+		local_lookup = True;
+	} else if (lp_server_role() == ROLE_DOMAIN_PDC || 
+		   lp_server_role() == ROLE_DOMAIN_BDC) {
+		if (strequal(domain, lp_workgroup())) {
+			local_lookup = True;
+		}
+	}
+		
+	if (local_lookup) {
+		if (local_lookup_name(name, psid, name_type)) {
+			DEBUG(10,
+			      ("lookup_name: (local) [%s]\\[%s] -> SID %s (type %s: %u)\n",
+			       domain, name, sid_to_string(sid,psid),
+			       sid_type_lookup(*name_type), (unsigned int)*name_type));
+			return True;
+		}
+	} else {
+		/* Remote */
+		if (winbind_lookup_name(domain, name, psid, name_type)) {
+			
+			DEBUG(10,("lookup_name (winbindd): [%s]\\[%s] -> SID %s (type %u)\n",
+				  domain, name, sid_to_string(sid, psid), 
+				  (unsigned int)*name_type));
+			return True;
+		}
+	}
+	
+	DEBUG(10, ("lookup_name: %s lookup for [%s]\\[%s] failed\n", 
+		   local_lookup ? "local" : "winbind", domain, name));
+
+	return False;
+}
+
+/*****************************************************************
+ *THE CANONICAL* convert SID to name function.
+ Tries local lookup first - for local sids, then tries winbind.
+*****************************************************************/  
+
+BOOL lookup_sid(DOM_SID *sid, fstring dom_name, fstring name, enum SID_NAME_USE *name_type)
+{
+	if (!name_type)
+		return False;
+
+	*name_type = SID_NAME_UNKNOWN;
+
+	/* Check if this is our own sid.  This should perhaps be done by
+	   winbind?  For the moment handle it here. */
+
+	if (sid->num_auths == 5) {
+		DOM_SID tmp_sid;
+		uint32 rid;
+
+		sid_copy(&tmp_sid, sid);
+		sid_split_rid(&tmp_sid, &rid);
+
+		if (sid_equal(get_global_sam_sid(), &tmp_sid)) {
+
+			return map_domain_sid_to_name(&tmp_sid, dom_name) &&
+				local_lookup_sid(sid, name, name_type);
+		}
+	}
+
+	if (!winbind_lookup_sid(sid, dom_name, name, name_type)) {
+		fstring sid_str;
+		DOM_SID tmp_sid;
+		uint32 rid;
+
+		DEBUG(10,("lookup_sid: winbind lookup for SID %s failed - trying local.\n", sid_to_string(sid_str, sid) ));
+
+		sid_copy(&tmp_sid, sid);
+		sid_split_rid(&tmp_sid, &rid);
+		return map_domain_sid_to_name(&tmp_sid, dom_name) &&
+			lookup_known_rid(&tmp_sid, rid, name, name_type);
+	}
+	return True;
+}
+
+
+/*****************************************************************
+ Id mapping cache.  This is to avoid Winbind mappings already
+ seen by smbd to be queried too frequently, keeping winbindd
+ busy, and blocking smbd while winbindd is busy with other
+ stuff. Written by Michael Steffens <michael.steffens@hp.com>,
+ modified to use linked lists by jra.
+*****************************************************************/  
+
+#define MAX_UID_SID_CACHE_SIZE 100
+#define TURNOVER_UID_SID_CACHE_SIZE 10
+#define MAX_GID_SID_CACHE_SIZE 100
+#define TURNOVER_GID_SID_CACHE_SIZE 10
+
+static size_t n_uid_sid_cache = 0;
+static size_t n_gid_sid_cache = 0;
+
+static struct uid_sid_cache {
+	struct uid_sid_cache *next, *prev;
+	uid_t uid;
+	DOM_SID sid;
+	enum SID_NAME_USE sidtype;
+} *uid_sid_cache_head;
+
+static struct gid_sid_cache {
+	struct gid_sid_cache *next, *prev;
+	gid_t gid;
+	DOM_SID sid;
+	enum SID_NAME_USE sidtype;
+} *gid_sid_cache_head;
+
+/*****************************************************************
+  Find a SID given a uid.
+*****************************************************************/  
+
+static BOOL fetch_sid_from_uid_cache(DOM_SID *psid, uid_t uid)
+{
+	struct uid_sid_cache *pc;
+
+	for (pc = uid_sid_cache_head; pc; pc = pc->next) {
+		if (pc->uid == uid) {
+			fstring sid;
+			*psid = pc->sid;
+			DEBUG(3,("fetch sid from uid cache %u -> %s\n",
+				(unsigned int)uid, sid_to_string(sid, psid)));
+			DLIST_PROMOTE(uid_sid_cache_head, pc);
+			return True;
+		}
+	}
+	return False;
+}
+
+/*****************************************************************
+  Find a uid given a SID.
+*****************************************************************/  
+
+static BOOL fetch_uid_from_cache( uid_t *puid, const DOM_SID *psid )
+{
+	struct uid_sid_cache *pc;
+
+	for (pc = uid_sid_cache_head; pc; pc = pc->next) {
+		if (sid_compare(&pc->sid, psid) == 0) {
+			fstring sid;
+			*puid = pc->uid;
+			DEBUG(3,("fetch uid from cache %u -> %s\n",
+				(unsigned int)*puid, sid_to_string(sid, psid)));
+			DLIST_PROMOTE(uid_sid_cache_head, pc);
+			return True;
+		}
+	}
+	return False;
+}
+
+/*****************************************************************
+ Store uid to SID mapping in cache.
+*****************************************************************/  
+
+static void store_uid_sid_cache(const DOM_SID *psid, uid_t uid)
+{
+	struct uid_sid_cache *pc;
+
+	if (n_uid_sid_cache >= MAX_UID_SID_CACHE_SIZE && n_uid_sid_cache > TURNOVER_UID_SID_CACHE_SIZE) {
+		/* Delete the last TURNOVER_UID_SID_CACHE_SIZE entries. */
+		struct uid_sid_cache *pc_next;
+		size_t i;
+
+		for (i = 0, pc = uid_sid_cache_head; i < (n_uid_sid_cache - TURNOVER_UID_SID_CACHE_SIZE); i++, pc = pc->next)
+			;
+		for(; pc; pc = pc_next) {
+			pc_next = pc->next;
+			DLIST_REMOVE(uid_sid_cache_head,pc);
+			SAFE_FREE(pc);
+			n_uid_sid_cache--;
+		}
+	}
+
+	pc = (struct uid_sid_cache *)malloc(sizeof(struct uid_sid_cache));
+	if (!pc)
+		return;
+	pc->uid = uid;
+	sid_copy(&pc->sid, psid);
+	DLIST_ADD(uid_sid_cache_head, pc);
+	n_uid_sid_cache++;
+}
+
+/*****************************************************************
+  Find a SID given a gid.
+*****************************************************************/  
+
+static BOOL fetch_sid_from_gid_cache(DOM_SID *psid, gid_t gid)
+{
+	struct gid_sid_cache *pc;
+
+	for (pc = gid_sid_cache_head; pc; pc = pc->next) {
+		if (pc->gid == gid) {
+			fstring sid;
+			*psid = pc->sid;
+			DEBUG(3,("fetch sid from gid cache %u -> %s\n",
+				(unsigned int)gid, sid_to_string(sid, psid)));
+			DLIST_PROMOTE(gid_sid_cache_head, pc);
+			return True;
+		}
+	}
+	return False;
+}
+
+/*****************************************************************
+  Find a gid given a SID.
+*****************************************************************/  
+
+static BOOL fetch_gid_from_cache(gid_t *pgid, const DOM_SID *psid)
+{
+	struct gid_sid_cache *pc;
+
+	for (pc = gid_sid_cache_head; pc; pc = pc->next) {
+		if (sid_compare(&pc->sid, psid) == 0) {
+			fstring sid;
+			*pgid = pc->gid;
+			DEBUG(3,("fetch uid from cache %u -> %s\n",
+				(unsigned int)*pgid, sid_to_string(sid, psid)));
+			DLIST_PROMOTE(gid_sid_cache_head, pc);
+			return True;
+		}
+	}
+	return False;
+}
+
+/*****************************************************************
+ Store gid to SID mapping in cache.
+*****************************************************************/  
+
+static void store_gid_sid_cache(const DOM_SID *psid, gid_t gid)
+{
+	struct gid_sid_cache *pc;
+
+	if (n_gid_sid_cache >= MAX_GID_SID_CACHE_SIZE && n_gid_sid_cache > TURNOVER_GID_SID_CACHE_SIZE) {
+		/* Delete the last TURNOVER_GID_SID_CACHE_SIZE entries. */
+		struct gid_sid_cache *pc_next;
+		size_t i;
+
+		for (i = 0, pc = gid_sid_cache_head; i < (n_gid_sid_cache - TURNOVER_GID_SID_CACHE_SIZE); i++, pc = pc->next)
+			;
+		for(; pc; pc = pc_next) {
+			pc_next = pc->next;
+			DLIST_REMOVE(gid_sid_cache_head,pc);
+			SAFE_FREE(pc);
+			n_gid_sid_cache--;
+		}
+	}
+
+	pc = (struct gid_sid_cache *)malloc(sizeof(struct gid_sid_cache));
+	if (!pc)
+		return;
+	pc->gid = gid;
+	sid_copy(&pc->sid, psid);
+	DLIST_ADD(gid_sid_cache_head, pc);
+	n_gid_sid_cache++;
+}
+
+/*****************************************************************
+ *THE CANONICAL* convert uid_t to SID function.
+*****************************************************************/  
+
+NTSTATUS uid_to_sid(DOM_SID *psid, uid_t uid)
+{
+	uid_t low, high;
+	fstring sid;
+
+	ZERO_STRUCTP(psid);
+
+	if (fetch_sid_from_uid_cache(psid, uid))
+		return ( psid ? NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL );
+
+	if (lp_idmap_uid(&low, &high) && uid >= low && uid <= high) {
+		if (winbind_uid_to_sid(psid, uid)) {
+
+			DEBUG(10,("uid_to_sid: winbindd %u -> %s\n",
+				(unsigned int)uid, sid_to_string(sid, psid)));
+
+			if (psid)
+				store_uid_sid_cache(psid, uid);
+			return ( psid ? NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL );
+		}
+	}
+
+	if (!local_uid_to_sid(psid, uid)) {
+		DEBUG(10,("uid_to_sid: local %u failed to map to sid\n", (unsigned int)uid ));
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+        
+	DEBUG(10,("uid_to_sid: local %u -> %s\n", (unsigned int)uid, sid_to_string(sid, psid)));
+
+	store_uid_sid_cache(psid, uid);
+	return NT_STATUS_OK;
+}
+
+/*****************************************************************
+ *THE CANONICAL* convert gid_t to SID function.
+*****************************************************************/  
+
+NTSTATUS gid_to_sid(DOM_SID *psid, gid_t gid)
+{
+	gid_t low, high;
+	fstring sid;
+
+	ZERO_STRUCTP(psid);
+
+	if (fetch_sid_from_gid_cache(psid, gid))
+		return ( psid ? NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL );
+
+	if (lp_idmap_gid(&low, &high) && gid >= low && gid <= high) {
+		if (winbind_gid_to_sid(psid, gid)) {
+
+			DEBUG(10,("gid_to_sid: winbindd %u -> %s\n",
+				(unsigned int)gid, sid_to_string(sid, psid)));
+                        
+			if (psid)
+				store_gid_sid_cache(psid, gid);
+			return ( psid ? NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL );
+		}
+	}
+
+	if (!local_gid_to_sid(psid, gid)) {
+		DEBUG(10,("gid_to_sid: local %u failed to map to sid\n", (unsigned int)gid ));
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+        
+	DEBUG(10,("gid_to_sid: local %u -> %s\n", (unsigned int)gid, sid_to_string(sid, psid)));
+
+	store_gid_sid_cache(psid, gid);
+	return NT_STATUS_OK;
+}
+
+/*****************************************************************
+ *THE CANONICAL* convert SID to uid function.
+*****************************************************************/  
+
+NTSTATUS sid_to_uid(const DOM_SID *psid, uid_t *puid)
+{
+	fstring dom_name, name, sid_str;
+	enum SID_NAME_USE name_type;
+
+	if (fetch_uid_from_cache(puid, psid))
+		return NT_STATUS_OK;
+
+	/* if this is our SID then go straight to a local lookup */
+	
+	if ( sid_compare_domain(get_global_sam_sid(), psid) == 0 ) {
+		DEBUG(10,("sid_to_uid: my domain (%s) - trying local.\n",
+			sid_string_static(psid) ));
+		
+		if ( local_sid_to_uid(puid, psid, &name_type) )
+			goto success;
+			
+		DEBUG(10,("sid_to_uid: local lookup failed\n"));
+		
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+	
+	/* If it is not our local domain, only hope is winbindd */
+
+	if ( !winbind_lookup_sid(psid, dom_name, name, &name_type) ) {
+		DEBUG(10,("sid_to_uid: winbind lookup for non-local sid %s failed\n",
+			sid_string_static(psid) ));
+			
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+
+	/* If winbindd does know the SID, ensure this is a user */
+
+	if (name_type != SID_NAME_USER) {
+		DEBUG(10,("sid_to_uid: winbind lookup succeeded but SID is not a user (%u)\n",
+			(unsigned int)name_type ));
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	/* get the uid.  Has to work or else we are dead in the water */
+
+	if ( !winbind_sid_to_uid(puid, psid) ) {
+		DEBUG(10,("sid_to_uid: winbind failed to allocate a new uid for sid %s\n",
+			sid_to_string(sid_str, psid) ));
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+
+success:
+	DEBUG(10,("sid_to_uid: %s -> %u\n", sid_to_string(sid_str, psid),
+		(unsigned int)*puid ));
+
+	store_uid_sid_cache(psid, *puid);
+	
+	return NT_STATUS_OK;
+}
+/*****************************************************************
+ *THE CANONICAL* convert SID to gid function.
+ Group mapping is used for gids that maps to Wellknown SIDs
+*****************************************************************/  
+
+NTSTATUS sid_to_gid(const DOM_SID *psid, gid_t *pgid)
+{
+	fstring dom_name, name, sid_str;
+	enum SID_NAME_USE name_type;
+
+	if (fetch_gid_from_cache(pgid, psid))
+		return NT_STATUS_OK;
+
+	/*
+	 * First we must look up the name and decide if this is a group sid.
+	 * Group mapping can deal with foreign SIDs
+	 */
+
+	if (!winbind_lookup_sid(psid, dom_name, name, &name_type)) {
+		DEBUG(10,("sid_to_gid: winbind lookup for sid %s failed - trying local.\n",
+			sid_to_string(sid_str, psid) ));
+
+		if ( local_sid_to_gid(pgid, psid, &name_type) )
+			goto success;
+			
+		DEBUG(10,("sid_to_gid: no one knows this SID\n"));
+		
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+
+	/* winbindd knows it; Ensure this is a group sid */
+
+	if ((name_type != SID_NAME_DOM_GRP) && (name_type != SID_NAME_ALIAS) && (name_type != SID_NAME_WKN_GRP)) {
+		DEBUG(10,("sid_to_gid: winbind lookup succeeded but SID is not a known group (%u)\n",
+			(unsigned int)name_type ));
+
+		/* winbindd is running and knows about this SID.  Just the wrong type.
+		   Don't fallback to a local lookup here */
+		   
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+	
+	/* winbindd knows it and it is a type of group; sid_to_gid must succeed
+	   or we are dead in the water */
+
+	if ( !winbind_sid_to_gid(pgid, psid) ) {
+		DEBUG(10,("sid_to_uid: winbind failed to allocate a new gid for sid %s\n",
+			sid_to_string(sid_str, psid) ));
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+
+success:
+	DEBUG(10,("sid_to_gid: %s -> %u\n", sid_to_string(sid_str, psid),
+		(unsigned int)*pgid ));
+
+	store_gid_sid_cache(psid, *pgid);
+	
+	return NT_STATUS_OK;
+}
+