diff options
Diffstat (limited to 'source3/smbd/uid.c')
| -rw-r--r-- | source3/smbd/uid.c | 372 |
1 files changed, 372 insertions, 0 deletions
diff --git a/source3/smbd/uid.c b/source3/smbd/uid.c index c68d00025c..8d3e7cd9be 100644 --- a/source3/smbd/uid.c +++ b/source3/smbd/uid.c @@ -529,3 +529,375 @@ BOOL lookup_sid(DOM_SID *sid, fstring dom_name, fstring name, enum SID_NAME_USE } 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; +} |