diff options
| -rw-r--r-- | source3/smbd/groupname.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/source3/smbd/groupname.c b/source3/smbd/groupname.c new file mode 100644 index 0000000000..4cfd3e98f5 --- /dev/null +++ b/source3/smbd/groupname.c @@ -0,0 +1,204 @@ +/* + Unix SMB/Netbios implementation. + Version 1.9. + Groupname handling + Copyright (C) Jeremy Allison 1998. + + 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" +extern int DEBUGLEVEL; +extern DOM_SID global_machine_sid; + + +/************************************************************************** + Groupname map functionality. The code loads a groupname map file and + (currently) loads it into a linked list. This is slow and memory + hungry, but can be changed into a more efficient storage format + if the demands on it become excessive. +***************************************************************************/ + +typedef struct groupname_map { + ubi_slNode next; + + char *windows_name; + DOM_SID windows_sid; + char *unix_name; + gid_t unix_gid; +} groupname_map_entry; + +static ubi_slList groupname_map_list; + +/************************************************************************** + Delete all the entries in the groupname map list. +***************************************************************************/ + +static void delete_groupname_map_list(void) +{ + groupname_map_entry *gmep; + + while((gmep = (groupname_map_entry *)ubi_slRemHead( &groupname_map_list )) != NULL) { + if(gmep->windows_name) + free(gmep->windows_name); + if(gmep->unix_name) + free(gmep->unix_name); + free((char *)gmep); + } +} + +/************************************************************************** + Load a groupname map file. Sets last accessed timestamp. +***************************************************************************/ + +void load_groupname_map(void) +{ + static time_t groupmap_file_last_modified = (time_t)0; + static BOOL initialized = False; + char *groupname_map_file = lp_groupname_map(); + struct stat st; + FILE *fp; + char *s; + pstring buf; + groupname_map_entry *new_ep; + + if(!initialized) { + ubi_slInitList( &groupname_map_list ); + initialized = True; + } + + if (!*groupname_map_file) + return; + + if(stat(groupname_map_file, &st) != 0) { + DEBUG(0, ("load_groupname_map: Unable to stat file %s. Error was %s\n", + groupname_map_file, strerror(errno) )); + return; + } + + /* + * Check if file has changed. + */ + if( st.st_mtime <= groupmap_file_last_modified) + return; + + groupmap_file_last_modified = st.st_mtime; + + /* + * Load the file. + */ + + fp = fopen(groupname_map_file,"r"); + if (!fp) { + DEBUG(0,("load_groupname_map: can't open groupname map %s. Error was %s\n", + groupname_map_file, strerror(errno))); + return; + } + + /* + * Throw away any previous list. + */ + delete_groupname_map_list(); + + DEBUG(4,("load_groupname_map: Scanning groupname map %s\n",groupname_map_file)); + + while((s=fgets_slash(buf,sizeof(buf),fp))!=NULL) { + pstring unixname; + pstring windows_name; + struct group *gptr; + DOM_SID tmp_sid; + + DEBUG(10,("load_groupname_map: Read line |%s|\n", s)); + + if (!*s || strchr("#;",*s)) + continue; + + if(!next_token(&s,unixname, "\t\n\r=")) + continue; + + if(!next_token(&s,windows_name, "\t\n\r=")) + continue; + + trim_string(unixname, " ", " "); + trim_string(windows_name, " ", " "); + + if (!*windows_name) + continue; + + if(!*unixname) + continue; + + DEBUG(5,("load_groupname_map: unixname = %s, windowsname = %s.\n", + unixname, windows_name)); + + /* + * Attempt to get the unix gid_t for this name. + */ + + if((gptr = (struct group *)getgrnam(unixname)) == NULL) { + DEBUG(0,("load_groupname_map: getgrnam for group %s failed.\ +Error was %s.\n", unixname, strerror(errno) )); + continue; + } + + /* + * Now map to an NT SID. + */ + + if(!lookup_wellknown_sid_from_name(windows_name, &tmp_sid)) { + /* + * It's not a well known name, convert the UNIX gid_t + * to a rid within this domain SID. + */ + tmp_sid = global_machine_sid; + tmp_sid.sub_auths[tmp_sid.num_auths++] = + pdb_gid_to_group_rid((gid_t)gptr->gr_gid); + } + + /* + * Create the list entry and add it onto the list. + */ + + if((new_ep = (groupname_map_entry *)malloc( sizeof(groupname_map_entry) ))== NULL) { + DEBUG(0,("load_groupname_map: malloc fail for groupname_map_entry.\n")); + fclose(fp); + return; + } + + new_ep->unix_gid = gptr->gr_gid; + new_ep->windows_sid = tmp_sid; + new_ep->windows_name = strdup( windows_name ); + new_ep->unix_name = strdup( unixname ); + + if(new_ep->windows_name == NULL || new_ep->unix_name == NULL) { + DEBUG(0,("load_groupname_map: malloc fail for names in groupname_map_entry.\n")); + fclose(fp); + if(new_ep->windows_name != NULL) + free(new_ep->windows_name); + if(new_ep->unix_name != NULL) + free(new_ep->unix_name); + free((char *)new_ep); + return; + } + memset((char *)&new_ep->next, '\0', sizeof(new_ep->next) ); + + ubi_slAddHead( &groupname_map_list, (ubi_slNode *)new_ep); + } + + DEBUG(10,("load_groupname_map: Added %d entries to groupname map.\n", + ubi_slCount( &groupname_map_list ) )); + + fclose(fp); +} |