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/*
Unix SMB/CIFS implementation.
Username handling
Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Jeremy Allison 1997-2001.
Copyright (C) Volker Lendecke 2006
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 "smbd/globals.h"
/*******************************************************************
Map a username from a dos name to a unix name by looking in the username
map. Note that this modifies the name in place.
This is the main function that should be called *once* on
any incoming or new username - in order to canonicalize the name.
This is being done to de-couple the case conversions from the user mapping
function. Previously, the map_username was being called
every time Get_Pwnam_alloc was called.
Returns True if username was changed, false otherwise.
********************************************************************/
static const char *get_last_from(void)
{
if (!last_from) {
return "";
}
return last_from;
}
static const char *get_last_to(void)
{
if (!last_to) {
return "";
}
return last_to;
}
static bool set_last_from_to(const char *from, const char *to)
{
char *orig_from = last_from;
char *orig_to = last_to;
last_from = SMB_STRDUP(from);
last_to = SMB_STRDUP(to);
SAFE_FREE(orig_from);
SAFE_FREE(orig_to);
if (!last_from || !last_to) {
SAFE_FREE(last_from);
SAFE_FREE(last_to);
return false;
}
return true;
}
bool map_username(struct smbd_server_connection *sconn, fstring user)
{
XFILE *f;
char *mapfile = lp_username_map();
char *s;
char buf[512];
bool mapped_user = False;
char *cmd = lp_username_map_script();
if (!*user)
return false;
if (strequal(user,get_last_to()))
return false;
if (strequal(user,get_last_from())) {
DEBUG(3,("Mapped user %s to %s\n",user,get_last_to()));
fstrcpy(user,get_last_to());
return true;
}
/* first try the username map script */
if ( *cmd ) {
char **qlines;
char *command = NULL;
int numlines, ret, fd;
command = talloc_asprintf(talloc_tos(),
"%s \"%s\"",
cmd,
user);
if (!command) {
return false;
}
DEBUG(10,("Running [%s]\n", command));
ret = smbrun(command, &fd);
DEBUGADD(10,("returned [%d]\n", ret));
if ( ret != 0 ) {
if (fd != -1)
close(fd);
return False;
}
numlines = 0;
qlines = fd_lines_load(fd, &numlines,0, NULL);
DEBUGADD(10,("Lines returned = [%d]\n", numlines));
close(fd);
/* should be either no lines or a single line with the mapped username */
if (numlines && qlines) {
DEBUG(3,("Mapped user %s to %s\n", user, qlines[0] ));
fstrcpy( user, qlines[0] );
}
TALLOC_FREE(qlines);
return numlines != 0;
}
/* ok. let's try the mapfile */
if (!*mapfile)
return False;
f = x_fopen(mapfile,O_RDONLY, 0);
if (!f) {
DEBUG(0,("can't open username map %s. Error %s\n",mapfile, strerror(errno) ));
return False;
}
DEBUG(4,("Scanning username map %s\n",mapfile));
while((s=fgets_slash(buf,sizeof(buf),f))!=NULL) {
char *unixname = s;
char *dosname = strchr_m(unixname,'=');
const char **dosuserlist;
bool return_if_mapped = False;
if (!dosname)
continue;
*dosname++ = 0;
while (isspace((int)*unixname))
unixname++;
if ('!' == *unixname) {
return_if_mapped = True;
unixname++;
while (*unixname && isspace((int)*unixname))
unixname++;
}
if (!*unixname || strchr_m("#;",*unixname))
continue;
{
int l = strlen(unixname);
while (l && isspace((int)unixname[l-1])) {
unixname[l-1] = 0;
l--;
}
}
/* skip lines like 'user = ' */
dosuserlist = str_list_make_v3(talloc_tos(), dosname, NULL);
if (!dosuserlist) {
DEBUG(0,("Bad username map entry. Unable to build user list. Ignoring.\n"));
continue;
}
if (strchr_m(dosname,'*') ||
user_in_list(sconn, user, (const char **)dosuserlist)) {
DEBUG(3,("Mapped user %s to %s\n",user,unixname));
mapped_user = True;
set_last_from_to(user, unixname);
fstrcpy( user, unixname );
if ( return_if_mapped ) {
TALLOC_FREE(dosuserlist);
x_fclose(f);
return True;
}
}
TALLOC_FREE(dosuserlist);
}
x_fclose(f);
/*
* Setup the last_from and last_to as an optimization so
* that we don't scan the file again for the same user.
*/
set_last_from_to(user, user);
return mapped_user;
}
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