Username handling
Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Jeremy Allison 1997-2001.
-
+ Copyright (C) Andrew Bartlett 2002
+
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
+ 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, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
+#include "system/passwd.h"
+#include "memcache.h"
+#include "../lib/util/util_pw.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);
+static struct passwd *uname_string_combinations(char *s, TALLOC_CTX *mem_ctx,
+ struct passwd * (*fn) (TALLOC_CTX *mem_ctx, const char *),
+ int N);
+static struct passwd *uname_string_combinations2(char *s, TALLOC_CTX *mem_ctx, int offset,
+ struct passwd * (*fn) (TALLOC_CTX *mem_ctx, const char *),
+ int N);
+
+static struct passwd *getpwnam_alloc_cached(TALLOC_CTX *mem_ctx, const char *name)
+{
+ struct passwd *pw, *for_cache;
-/*****************************************************************
- Check if a user or group name is local (this is a *local* name for
- *local* people, there's nothing for you here...).
-*****************************************************************/
+ pw = (struct passwd *)memcache_lookup_talloc(
+ NULL, GETPWNAM_CACHE, data_blob_string_const_null(name));
+ if (pw != NULL) {
+ return tcopy_passwd(mem_ctx, pw);
+ }
-static BOOL name_is_local(const char *name)
-{
- return !(strchr_m(name, *lp_winbind_separator()));
+ pw = getpwnam(name);
+ if (pw == NULL) {
+ return NULL;
+ }
+
+ for_cache = tcopy_passwd(talloc_tos(), pw);
+ if (for_cache == NULL) {
+ return NULL;
+ }
+
+ memcache_add_talloc(NULL, GETPWNAM_CACHE,
+ data_blob_string_const_null(name), &for_cache);
+
+ return tcopy_passwd(mem_ctx, pw);
}
-/*****************************************************************
- Splits passed user or group name to domain and user/group name parts
- Returns True if name was splitted and False otherwise.
-*****************************************************************/
+/****************************************************************************
+ Flush all cached passwd structs.
+****************************************************************************/
-BOOL split_domain_and_name(const char *name, char *domain, char* username)
+void flush_pwnam_cache(void)
{
- char *p = strchr(name,*lp_winbind_separator());
-
-
- /* Parse a string of the form DOMAIN/user into a domain and a user */
- DEBUG(10,("split_domain_and_name: checking whether name |%s| local or not\n", name));
-
- if (p) {
- fstrcpy(username, p+1);
- fstrcpy(domain, name);
- domain[PTR_DIFF(p, name)] = 0;
- } else if (lp_winbind_use_default_domain()) {
- fstrcpy(username, name);
- fstrcpy(domain, lp_workgroup());
- } else {
- return False;
- }
-
- DEBUG(10,("split_domain_and_name: all is fine, domain is |%s| and name is |%s|\n", domain, username));
- return True;
+ memcache_flush(NULL, GETPWNAM_CACHE);
}
/****************************************************************************
Get a users home directory.
****************************************************************************/
-char *get_user_home_dir(const char *user)
+char *get_user_home_dir(TALLOC_CTX *mem_ctx, const char *user)
{
- static struct passwd *pass;
+ struct passwd *pass;
+ char *result;
/* Ensure the user exists. */
- pass = Get_Pwnam(user);
+ pass = Get_Pwnam_alloc(mem_ctx, user);
if (!pass)
return(NULL);
- /* Return home directory from struct passwd. */
-
- 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((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--;
- }
- }
-
- dosuserlist = str_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) {
- str_list_free (&dosuserlist);
- x_fclose(f);
- return True;
- }
- }
-
- str_list_free (&dosuserlist);
- }
-
- x_fclose(f);
+ /* Return home directory from struct passwd. */
- /*
- * 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);
+ result = talloc_move(mem_ctx, &pass->pw_dir);
- return mapped_user;
+ TALLOC_FREE(pass);
+ return result;
}
/****************************************************************************
- * A wrapper for sys_getpwnam(). The following variations are tried:
+ * 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.
****************************************************************************/
-static struct passwd *Get_Pwnam_ret = NULL;
-
-static struct passwd *Get_Pwnam_internals(const char *user, char *user2)
+static struct passwd *Get_Pwnam_internals(TALLOC_CTX *mem_ctx,
+ const char *user, char *user2)
{
struct passwd *ret = NULL;
/* Try in all lower case first as this is the most
common case on UNIX systems */
- strlower(user2);
+ if (!strlower_m(user2)) {
+ DEBUG(5,("strlower_m %s failed\n", user2));
+ goto done;
+ }
+
DEBUG(5,("Trying _Get_Pwnam(), username as lowercase is %s\n",user2));
- ret = getpwnam_alloc(user2);
+ ret = getpwnam_alloc_cached(mem_ctx, 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 = getpwnam_alloc(user);
+ DEBUG(5,("Trying _Get_Pwnam(), username as given is %s\n",
+ user));
+ ret = getpwnam_alloc_cached(mem_ctx, user);
if(ret)
goto done;
}
/* Try as uppercase, if username wasn't originally uppercase */
- strupper(user2);
+ if (!strupper_m(user2)) {
+ goto done;
+ }
+
if(strcmp(user, user2) != 0) {
- DEBUG(5,("Trying _Get_Pwnam(), username as uppercase is %s\n", user2));
- ret = getpwnam_alloc(user2);
+ DEBUG(5,("Trying _Get_Pwnam(), username as uppercase is %s\n",
+ user2));
+ ret = getpwnam_alloc_cached(mem_ctx, 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, getpwnam_alloc, lp_usernamelevel());
+ if (!strlower_m(user2)) {
+ DEBUG(5,("strlower_m %s failed\n", user2));
+ goto done;
+ }
+ DEBUG(5,("Checking combinations of %d uppercase letters in %s\n",
+ lp_usernamelevel(), user2));
+ ret = uname_string_combinations(user2, mem_ctx, getpwnam_alloc_cached,
+ lp_usernamelevel());
done:
- DEBUG(5,("Get_Pwnam_internals %s find user [%s]!\n",ret ? "did":"didn't", user));
-
- /* This call used to just return the 'passwd' static buffer.
- This could then have accidental reuse implications, so
- we now malloc a copy, and free it in the next use.
-
- This should cause the (ab)user to segfault if it
- uses an old struct.
-
- This is better than useing the wrong data in security
- critical operations.
-
- The real fix is to make the callers free the returned
- malloc'ed data.
- */
-
- if (Get_Pwnam_ret) {
- passwd_free(&Get_Pwnam_ret);
- }
-
- Get_Pwnam_ret = ret;
+ DEBUG(5,("Get_Pwnam_internals %s find user [%s]!\n",ret ?
+ "did":"didn't", user));
return ret;
}
-/****************************************************************************
- Get_Pwnam wrapper for modification.
- NOTE: This can potentially modify 'user'!
-****************************************************************************/
-
-struct passwd *Get_Pwnam_Modify(fstring 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'!
+ This will return an allocated structure
****************************************************************************/
-struct passwd *Get_Pwnam(const char *user)
+struct passwd *Get_Pwnam_alloc(TALLOC_CTX *mem_ctx, const char *user)
{
fstring user2;
- struct passwd *ret;
-
- fstrcpy(user2, user);
-
- DEBUG(5,("Finding user %s\n", user));
-
- ret = Get_Pwnam_internals(user, user2);
-
- 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 passwd *pass = Get_Pwnam(user);
- struct sys_userlist *user_list;
- struct sys_userlist *member;
-
- 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) {
- if (strequal(gname,gidtoname(pass->pw_gid))) {
- DEBUG(10,("user_in_unix_group_list: group %s is primary group.\n", gname ));
- return True;
- }
- }
-
- user_list = get_users_in_group(gname);
- if (user_list == NULL) {
- DEBUG(10,("user_in_unix_group_list: no such group %s\n", gname ));
- return False;
- }
-
- for (member = user_list; member; member = member->next) {
- DEBUG(10,("user_in_unix_group_list: checking user %s against member %s\n",
- user, member->unix_name ));
- if (strequal(member->unix_name,user)) {
- free_userlist(user_list);
- return(True);
- }
+ if ( *user == '\0' ) {
+ DEBUG(10,("Get_Pwnam: empty username!\n"));
+ return NULL;
}
- free_userlist(user_list);
- 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;
-
- ret = user_in_winbind_group_list(user, gname, &winbind_answered);
- if (!winbind_answered)
- ret = user_in_unix_group_list(user, gname);
-
- if (ret)
- DEBUG(10,("user_in_group_list: user |%s| is in group |%s|\n", user, gname));
- return ret;
-}
+ fstrcpy(user2, user);
-/****************************************************************************
- Check if a user is in a user list - can check combinations of UNIX
- and netgroup lists.
-****************************************************************************/
+ DEBUG(5,("Finding user %s\n", user));
-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) {
-
- DEBUG(10,("user_in_list: checking user |%s| against |%s|\n", user, *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;
- fstring groupname, domain;
-
- /* Parse a string of the form DOMAIN/user into a domain and a user */
-
- char *p = strchr(*list,*lp_winbind_separator());
-
- DEBUG(10,("user_in_list: checking if user |%s| is in winbind group |%s|\n", user, *list));
-
- if (p) {
- fstrcpy(groupname, p+1);
- fstrcpy(domain, *list);
- domain[PTR_DIFF(p, *list)] = 0;
-
- /* Check to see if name is a Windows group */
- if (winbind_lookup_name(domain, groupname, &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) {
- DEBUG(10,("user_in_list: user |%s| is in winbind group |%s|\n", user, *list));
- return ret;
- }
- }
- }
- }
-
- list++;
- }
- return(False);
+ return Get_Pwnam_internals(mem_ctx, user, user2);
}
/* The functions below have been taken from password.c and slightly modified */
it assumes the string starts lowercased
****************************************************************************/
-static struct passwd *uname_string_combinations2(char *s,int offset,struct passwd *(*fn)(const char *),int N)
+static struct passwd *uname_string_combinations2(char *s, TALLOC_CTX *mem_ctx,
+ int offset,
+ struct passwd *(*fn)(TALLOC_CTX *mem_ctx, const char *),
+ int N)
{
ssize_t len = (ssize_t)strlen(s);
int i;
struct passwd *ret;
if (N <= 0 || offset >= len)
- return(fn(s));
+ return(fn(mem_ctx, s));
for (i=offset;i<(len-(N-1));i++) {
char c = s[i];
- if (!islower((int)c))
+ if (!islower_m((int)c))
continue;
- s[i] = toupper(c);
- ret = uname_string_combinations2(s,i+1,fn,N-1);
+ s[i] = toupper_m(c);
+ ret = uname_string_combinations2(s, mem_ctx, i+1, fn, N-1);
if(ret)
return(ret);
s[i] = c;
it assumes the string starts lowercased
****************************************************************************/
-static struct passwd * uname_string_combinations(char *s,struct passwd * (*fn)(const char *),int N)
+static struct passwd * uname_string_combinations(char *s, TALLOC_CTX *mem_ctx,
+ struct passwd * (*fn)(TALLOC_CTX *mem_ctx, const char *),
+ int N)
{
int n;
struct passwd *ret;
for (n=1;n<=N;n++) {
- ret = uname_string_combinations2(s,0,fn,n);
+ ret = uname_string_combinations2(s,mem_ctx,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;
-}
git.samba.org / kai / samba.git / blobdiff