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samba-mirror/source3/auth/user_util.c
Andreas Schneider edda7a329e s3:smbd: Remove NIS support
Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
2021-04-22 17:57:30 +00:00

348 lines
7.6 KiB
C

/*
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 "system/filesys.h"
#include "auth.h"
#include "lib/gencache.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 char *last_from = NULL;
static char *last_to = NULL;
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;
}
static char *skip_space(char *s)
{
while (isspace((int)(*s))) {
s += 1;
}
return s;
}
static bool fetch_map_from_gencache(TALLOC_CTX *ctx,
const char *user_in,
char **p_user_out)
{
char *key, *value;
bool found;
if (lp_username_map_cache_time() == 0) {
return false;
}
key = talloc_asprintf_strupper_m(ctx, "USERNAME_MAP/%s",
user_in);
if (key == NULL) {
return false;
}
found = gencache_get(key, ctx, &value, NULL);
TALLOC_FREE(key);
if (!found) {
return false;
}
TALLOC_FREE(*p_user_out);
*p_user_out = value;
if (!*p_user_out) {
return false;
}
return true;
}
static void store_map_in_gencache(TALLOC_CTX *ctx, const char *from, const char *to)
{
char *key;
int cache_time = lp_username_map_cache_time();
if (cache_time == 0) {
return;
}
key = talloc_asprintf_strupper_m(ctx, "USERNAME_MAP/%s",
from);
if (key == NULL) {
return;
}
gencache_set(key, to, cache_time + time(NULL));
TALLOC_FREE(key);
}
/****************************************************************************
Check if a user is in a user list
We removed NIS support in 2021, but need to keep configs working.
TOOD FIXME: Remove this funciton
****************************************************************************/
bool user_in_list(TALLOC_CTX *ctx, const char *user, const char * const *list)
{
if (list == NULL || *list == NULL) {
return false;
}
DBG_DEBUG("Checking user %s in list\n", user);
while (*list) {
const char *p = *list;
bool ok;
/* Check raw username */
if (strequal(user, p)) {
return true;
}
while (*p == '@' || *p == '&' || *p == '+') {
p++;
}
ok = user_in_group(user, p);
if (ok) {
return true;
}
list++;
}
return false;
}
bool map_username(TALLOC_CTX *ctx, const char *user_in, char **p_user_out)
{
const struct loadparm_substitution *lp_sub =
loadparm_s3_global_substitution();
FILE *f;
char *mapfile = lp_username_map(talloc_tos(), lp_sub);
char *s;
char buf[512];
bool mapped_user = False;
char *cmd = lp_username_map_script(talloc_tos(), lp_sub);
*p_user_out = NULL;
if (!user_in)
return false;
/* Initially make a copy of the incoming name. */
*p_user_out = talloc_strdup(ctx, user_in);
if (!*p_user_out) {
return false;
}
if (strequal(user_in,get_last_to()))
return false;
if (strequal(user_in,get_last_from())) {
DEBUG(3,("Mapped user %s to %s\n",user_in,get_last_to()));
TALLOC_FREE(*p_user_out);
*p_user_out = talloc_strdup(ctx, get_last_to());
return true;
}
if (fetch_map_from_gencache(ctx, user_in, p_user_out)) {
return true;
}
/* first try the username map script */
if ( *cmd ) {
char **qlines;
char *command = NULL;
int numlines, ret, fd;
command = talloc_asprintf(ctx,
"%s \"%s\"",
cmd,
user_in);
if (!command) {
return false;
}
DEBUG(10,("Running [%s]\n", command));
ret = smbrun(command, &fd, NULL);
DEBUGADD(10,("returned [%d]\n", ret));
TALLOC_FREE(command);
if ( ret != 0 ) {
if (fd != -1)
close(fd);
return False;
}
numlines = 0;
qlines = fd_lines_load(fd, &numlines, 0, ctx);
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_in, qlines[0] ));
set_last_from_to(user_in, qlines[0]);
store_map_in_gencache(ctx, user_in, qlines[0]);
TALLOC_FREE(*p_user_out);
*p_user_out = talloc_strdup(ctx, qlines[0]);
if (!*p_user_out) {
return false;
}
}
TALLOC_FREE(qlines);
return numlines != 0;
}
/* ok. let's try the mapfile */
if (!*mapfile)
return False;
f = fopen(mapfile, "r");
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(NULL,buf,sizeof(buf),f))!=NULL) {
char *unixname = s;
char *dosname = strchr_m(unixname,'=');
char **dosuserlist;
bool return_if_mapped = False;
if (!dosname)
continue;
*dosname++ = 0;
unixname = skip_space(unixname);
if ('!' == *unixname) {
return_if_mapped = True;
unixname = skip_space(unixname+1);
}
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(ctx, 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(ctx, user_in, (const char * const *)dosuserlist)) {
DEBUG(3,("Mapped user %s to %s\n",user_in,unixname));
mapped_user = True;
set_last_from_to(user_in, unixname);
store_map_in_gencache(ctx, user_in, unixname);
TALLOC_FREE(*p_user_out);
*p_user_out = talloc_strdup(ctx, unixname);
if (!*p_user_out) {
TALLOC_FREE(dosuserlist);
fclose(f);
return false;
}
if ( return_if_mapped ) {
TALLOC_FREE(dosuserlist);
fclose(f);
return True;
}
}
TALLOC_FREE(dosuserlist);
}
fclose(f);
/*
* If we didn't successfully map a user in the loop above,
* setup the last_from and last_to as an optimization so
* that we don't scan the file again for the same user.
*/
if (!mapped_user) {
DEBUG(8, ("The user '%s' has no mapping. "
"Skip it next time.\n", user_in));
set_last_from_to(user_in, user_in);
store_map_in_gencache(ctx, user_in, user_in);
}
return mapped_user;
}