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/*
Unix SMB/Netbios implementation.
Version 1.9.
Username handling
Copyright (C) Andrew Tridgell 1992-1998
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"
/* internal functions */
static struct passwd *uname_string_combinations(char *s, struct passwd * (*fn) (const char *), int N);
static struct passwd *uname_string_combinations2(char *s, int offset, struct passwd * (*fn) (const char *), int N);
/****************************************************************************
Get a users home directory.
****************************************************************************/
char *get_user_home_dir(const char *user)
{
static struct passwd *pass;
pass = Get_Pwnam(user);
if (!pass)
return(NULL);
return(pass->pw_dir);
}
/*******************************************************************
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 was called.
Returns True if username was changed, false otherwise.
********************************************************************/
BOOL map_username(char *user)
{
static BOOL initialised=False;
static fstring last_from,last_to;
XFILE *f;
char *mapfile = lp_username_map();
char *s;
pstring buf;
BOOL mapped_user = False;
if (!*user)
return False;
if (!*mapfile)
return False;
if (!initialised) {
*last_from = *last_to = 0;
initialised = True;
}
if (strequal(user,last_to))
return False;
if (strequal(user,last_from)) {
DEBUG(3,("Mapped user %s to %s\n",user,last_to));
fstrcpy(user,last_to);
return True;
}
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,'=');
char **dosuserlist;
BOOL return_if_mapped = False;
if (!dosname)
continue;
*dosname++ = 0;
while (isspace(*unixname))
unixname++;
if ('!' == *unixname) {
return_if_mapped = True;
unixname++;
while (*unixname && isspace(*unixname))
unixname++;
}
if (!*unixname || strchr_m("#;",*unixname))
continue;
{
int l = strlen(unixname);
while (l && isspace(unixname[l-1])) {
unixname[l-1] = 0;
l--;
}
}
dosuserlist = lp_list_make(dosname);
if (!dosuserlist) {
DEBUG(0,("Unable to build user list\n"));
return False;
}
if (strchr_m(dosname,'*') || user_in_list(user, dosuserlist)) {
DEBUG(3,("Mapped user %s to %s\n",user,unixname));
mapped_user = True;
fstrcpy(last_from,user);
sscanf(unixname,"%s",user);
fstrcpy(last_to,user);
if(return_if_mapped) {
lp_list_free (&dosuserlist);
x_fclose(f);
return True;
}
}
lp_list_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.
*/
fstrcpy(last_from,user);
fstrcpy(last_to,user);
return mapped_user;
}
/****************************************************************************
Get_Pwnam wrapper
****************************************************************************/
static struct passwd *_Get_Pwnam(const char *s)
{
struct passwd *ret;
ret = sys_getpwnam(s);
if (ret) {
#ifdef HAVE_GETPWANAM
struct passwd_adjunct *pwret;
pwret = getpwanam(s);
if (pwret && pwret->pwa_passwd)
pstrcpy(ret->pw_passwd,pwret->pwa_passwd);
#endif
}
return(ret);
}
/****************************************************************************
* A wrapper for getpwnam(). The following variations are tried:
* - as transmitted
* - in all lower case if this differs from transmitted
* - in all upper case if this differs from transmitted
* - using lp_usernamelevel() for permutations.
****************************************************************************/
struct passwd *Get_Pwnam_internals(const char *user, char *user2)
{
struct passwd *ret = NULL;
if (!user2 || !(*user2))
return(NULL);
if (!user || !(*user))
return(NULL);
/* Try in all lower case first as this is the most
common case on UNIX systems */
strlower(user2);
DEBUG(5,("Trying _Get_Pwnam(), username as lowercase is %s\n",user2));
ret = _Get_Pwnam(user2);
if(ret)
goto done;
/* Try as given, if username wasn't originally lowercase */
if(strcmp(user,user2) != 0) {
DEBUG(5,("Trying _Get_Pwnam(), username as given is %s\n",user));
ret = _Get_Pwnam(user);
if(ret)
goto done;
}
/* Try as uppercase, if username wasn't originally uppercase */
strupper(user2);
if(strcmp(user,user2) != 0) {
DEBUG(5,("Trying _Get_Pwnam(), username as uppercase is %s\n",user2));
ret = _Get_Pwnam(user2);
if(ret)
goto done;
}
/* Try all combinations up to usernamelevel */
strlower(user2);
DEBUG(5,("Checking combinations of %d uppercase letters in %s\n",lp_usernamelevel(),user2));
ret = uname_string_combinations(user2, _Get_Pwnam, lp_usernamelevel());
done:
DEBUG(5,("Get_Pwnam %s find a valid username!\n",ret ? "did":"didn't"));
return ret;
}
/****************************************************************************
Get_Pwnam wrapper for modification.
NOTE: This can potentially modify 'user'!
****************************************************************************/
struct passwd *Get_Pwnam_Modify(char *user)
{
fstring user2;
struct passwd *ret;
fstrcpy(user2, user);
ret = Get_Pwnam_internals(user, user2);
/* If caller wants the modified username, ensure they get it */
fstrcpy(user,user2);
/* We can safely assume ret is NULL if none of the above succeed */
return(ret);
}
/****************************************************************************
Get_Pwnam wrapper without modification.
NOTE: This with NOT modify 'user'!
****************************************************************************/
struct passwd *Get_Pwnam(const char *user)
{
fstring user2;
struct passwd *ret;
fstrcpy(user2, user);
ret = Get_Pwnam_internals(user, user2);
/* We can safely assume ret is NULL if none of the above succeed */
return(ret);
}
/****************************************************************************
Check if a user is in a netgroup user list.
****************************************************************************/
static BOOL user_in_netgroup_list(const char *user, const char *ngname)
{
#ifdef HAVE_NETGROUP
static char *mydomain = NULL;
if (mydomain == NULL)
yp_get_default_domain(&mydomain);
if(mydomain == NULL) {
DEBUG(5,("Unable to get default yp domain\n"));
return False;
}
DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
user, mydomain, ngname));
DEBUG(5,("innetgr is %s\n", innetgr(ngname, NULL, user, mydomain)
? "TRUE" : "FALSE"));
if (innetgr(ngname, NULL, user, mydomain))
return (True);
#endif /* HAVE_NETGROUP */
return False;
}
/****************************************************************************
Check if a user is in a winbind group.
****************************************************************************/
static BOOL user_in_winbind_group_list(const char *user, const char *gname, BOOL *winbind_answered)
{
int num_groups;
int i;
gid_t *groups = NULL;
gid_t gid;
BOOL ret = False;
*winbind_answered = False;
/*
* Get the gid's that this user belongs to.
*/
if ((num_groups = winbind_getgroups(user, 0, NULL)) == -1)
return False;
if (num_groups == 0) {
*winbind_answered = True;
return False;
}
if ((groups = (gid_t *)malloc(sizeof(gid_t) * num_groups )) == NULL) {
DEBUG(0,("user_in_winbind_group_list: malloc fail.\n"));
goto err;
}
if ((num_groups = winbind_getgroups(user, num_groups, groups)) == -1) {
DEBUG(0,("user_in_winbind_group_list: second winbind_getgroups call \
failed with error %s\n", strerror(errno) ));
goto err;
}
/*
* Now we have the gid list for this user - convert the gname
* to a gid_t via either winbind or the local UNIX lookup and do the comparison.
*/
if ((gid = nametogid(gname)) == (gid_t)-1) {
DEBUG(0,("user_in_winbind_group_list: winbind_lookup_name for group %s failed.\n",
gname ));
goto err;
}
for (i = 0; i < num_groups; i++) {
if (gid == groups[i]) {
ret = True;
break;
}
}
*winbind_answered = True;
SAFE_FREE(groups);
return ret;
err:
*winbind_answered = False;
SAFE_FREE(groups);
return False;
}
/****************************************************************************
Check if a user is in a UNIX group.
****************************************************************************/
static BOOL user_in_unix_group_list(const char *user,const char *gname)
{
struct group *gptr;
char **member;
struct passwd *pass = Get_Pwnam(user);
DEBUG(10,("user_in_unix_group_list: checking user %s in group %s\n", user, gname));
/*
* We need to check the users primary group as this
* group is implicit and often not listed in the group database.
*/
if (pass) {
gptr = getgrgid(pass->pw_gid);
if (gptr && strequal(gptr->gr_name,gname)) {
DEBUG(10,("user_in_unix_group_list: group %s is primary group.\n", gname ));
return True;
}
}
if ((gptr = (struct group *)getgrnam(gname)) == NULL) {
DEBUG(10,("user_in_unix_group_list: no such group %s\n", gname ));
return False;
}
member = gptr->gr_mem;
while (member && *member) {
DEBUG(10,("user_in_unix_group_list: checking user %s against member %s\n", user, *member ));
if (strequal(*member,user)) {
return(True);
}
member++;
}
return False;
}
/****************************************************************************
Check if a user is in a group list. Ask winbind first, then use UNIX.
****************************************************************************/
BOOL user_in_group_list(const char *user, const char *gname)
{
BOOL winbind_answered = False;
BOOL ret = user_in_winbind_group_list(user, gname, &winbind_answered);
if (winbind_answered)
return ret;
return user_in_unix_group_list(user, gname);
}
/****************************************************************************
Check if a user is in a user list - can check combinations of UNIX
and netgroup lists.
****************************************************************************/
BOOL user_in_list(const char *user,char **list)
{
if (!list || !*list)
return False;
DEBUG(10,("user_in_list: checking user %s in list\n", user));
while (*list) {
/*
* Check raw username.
*/
if (strequal(user, *list))
return(True);
/*
* Now check to see if any combination
* of UNIX and netgroups has been specified.
*/
if(**list == '@') {
/*
* Old behaviour. Check netgroup list
* followed by UNIX list.
*/
if(user_in_netgroup_list(user, *list +1))
return True;
if(user_in_group_list(user, *list +1))
return True;
} else if (**list == '+') {
if((*(*list +1)) == '&') {
/*
* Search UNIX list followed by netgroup.
*/
if(user_in_group_list(user, *list +2))
return True;
if(user_in_netgroup_list(user, *list +2))
return True;
} else {
/*
* Just search UNIX list.
*/
if(user_in_group_list(user, *list +1))
return True;
}
} else if (**list == '&') {
if(*(*list +1) == '+') {
/*
* Search netgroup list followed by UNIX list.
*/
if(user_in_netgroup_list(user, *list +2))
return True;
if(user_in_group_list(user, *list +2))
return True;
} else {
/*
* Just search netgroup list.
*/
if(user_in_netgroup_list(user, *list +1))
return True;
}
} else if (!name_is_local(*list)) {
/*
* If user name did not match and token is not
* a unix group and the token has a winbind separator in the
* name then see if it is a Windows group.
*/
DOM_SID g_sid;
enum SID_NAME_USE name_type;
BOOL winbind_answered = False;
BOOL ret;
/* Check to see if name is a Windows group */
if (winbind_lookup_name(*list, &g_sid, &name_type) && name_type == SID_NAME_DOM_GRP) {
/* Check if user name is in the Windows group */
ret = user_in_winbind_group_list(user, *list, &winbind_answered);
if (winbind_answered && ret == True)
return ret;
}
}
list++;
}
return(False);
}
/* The functions below have been taken from password.c and slightly modified */
/****************************************************************************
Apply a function to upper/lower case combinations
of a string and return true if one of them returns true.
Try all combinations with N uppercase letters.
offset is the first char to try and change (start with 0)
it assumes the string starts lowercased
****************************************************************************/
static struct passwd *uname_string_combinations2(char *s,int offset,struct passwd *(*fn)(const char *),int N)
{
ssize_t len = (ssize_t)strlen(s);
int i;
struct passwd *ret;
#ifdef PASSWORD_LENGTH
len = MIN(len,PASSWORD_LENGTH);
#endif
if (N <= 0 || offset >= len)
return(fn(s));
for (i=offset;i<(len-(N-1));i++) {
char c = s[i];
if (!islower(c))
continue;
s[i] = toupper(c);
ret = uname_string_combinations2(s,i+1,fn,N-1);
if(ret)
return(ret);
s[i] = c;
}
return(NULL);
}
/****************************************************************************
Apply a function to upper/lower case combinations
of a string and return true if one of them returns true.
Try all combinations with up to N uppercase letters.
offset is the first char to try and change (start with 0)
it assumes the string starts lowercased
****************************************************************************/
static struct passwd * uname_string_combinations(char *s,struct passwd * (*fn)(const char *),int N)
{
int n;
struct passwd *ret;
for (n=1;n<=N;n++) {
ret = uname_string_combinations2(s,0,fn,n);
if(ret)
return(ret);
}
return(NULL);
}
/****************************************************************************
These wrappers allow appliance mode to work. In appliance mode the username
takes the form DOMAIN/user.
****************************************************************************/
struct passwd *smb_getpwnam(char *user, BOOL allow_change)
{
struct passwd *pw;
char *p;
char *sep;
extern pstring global_myname;
if (allow_change)
pw = Get_Pwnam_Modify(user);
else
pw = Get_Pwnam(user);
if (pw)
return pw;
/*
* If it is a domain qualified name and it isn't in our password
* database but the domain portion matches our local machine name then
* lookup just the username portion locally.
*/
sep = lp_winbind_separator();
p = strchr_m(user,*sep);
if (p && strncasecmp(global_myname, user, strlen(global_myname))==0) {
if (allow_change)
pw = Get_Pwnam_Modify(p+1);
else
pw = Get_Pwnam(p+1);
}
return NULL;
}
|