--- /dev/null
+/*
+ Unix SMB/CIFS implementation.
+ Username handling
+ Copyright (C) Andrew Tridgell 1992-1998
+ Copyright (C) Jeremy Allison 1997-2001.
+
+ 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);
+
+/*****************************************************************
+ Check if a user or group name is local (this is a *local* name for
+ *local* people, there's nothing for you here...).
+*****************************************************************/
+
+static BOOL name_is_local(const char *name)
+{
+ return !(strchr_m(name, *lp_winbind_separator()));
+}
+
+/****************************************************************************
+ Get a users home directory.
+****************************************************************************/
+
+char *get_user_home_dir(const char *user)
+{
+ static struct passwd *pass;
+
+ /* Ensure the user exists. */
+
+ pass = Get_Pwnam(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(fstring 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;
+ char *cmd = lp_username_map_script();
+
+ if (!*user)
+ return False;
+
+ 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;
+ }
+
+ /* first try the username map script */
+
+ if ( *cmd ) {
+ char **qlines;
+ pstring command;
+ int numlines, ret, fd;
+
+ pstr_sprintf( command, "%s \"%s\"", cmd, user );
+
+ 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);
+ DEBUGADD(10,("Lines returned = [%d]\n", numlines));
+ close(fd);
+
+ /* should be either no lines or a single line with the mapped username */
+
+ if (numlines) {
+ DEBUG(3,("Mapped user %s to %s\n", user, qlines[0] ));
+ fstrcpy( user, qlines[0] );
+ }
+
+ file_lines_free(qlines);
+
+ return numlines != 0;
+ }
+
+ /* ok. let's try the mapfile */
+
+ if (!*mapfile)
+ return False;
+
+ if (!initialised) {
+ *last_from = *last_to = 0;
+ initialised = 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, NULL);
+ if (!dosuserlist) {
+ DEBUG(0,("Unable to build user list\n"));
+ return False;
+ }
+
+ if (strchr_m(dosname,'*') || user_in_list(user, (const char **)dosuserlist, NULL, 0)) {
+ DEBUG(3,("Mapped user %s to %s\n",user,unixname));
+ mapped_user = True;
+ fstrcpy( last_from,user );
+ fstrcpy( user, unixname );
+ fstrcpy( last_to,user );
+ if ( return_if_mapped ) {
+ str_list_free (&dosuserlist);
+ x_fclose(f);
+ return True;
+ }
+ }
+
+ str_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;
+}
+
+/****************************************************************************
+ * A wrapper for sys_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)
+{
+ 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_m(user2);
+ DEBUG(5,("Trying _Get_Pwnam(), username as lowercase is %s\n",user2));
+ ret = getpwnam_alloc(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);
+ if(ret)
+ goto done;
+ }
+
+ /* Try as uppercase, if username wasn't originally uppercase */
+ strupper_m(user2);
+ if(strcmp(user, user2) != 0) {
+ DEBUG(5,("Trying _Get_Pwnam(), username as uppercase is %s\n",
+ user2));
+ ret = getpwnam_alloc(user2);
+ if(ret)
+ goto done;
+ }
+
+ /* Try all combinations up to usernamelevel */
+ strlower_m(user2);
+ DEBUG(5,("Checking combinations of %d uppercase letters in %s\n",
+ lp_usernamelevel(), user2));
+ ret = uname_string_combinations(user2, getpwnam_alloc,
+ lp_usernamelevel());
+
+done:
+ DEBUG(5,("Get_Pwnam_internals %s find user [%s]!\n",ret ?
+ "did":"didn't", user));
+
+ return ret;
+}
+
+/****************************************************************************
+ Get_Pwnam wrapper without modification.
+ NOTE: This with NOT modify 'user'!
+ This will return an allocated structure
+****************************************************************************/
+
+struct passwd *Get_Pwnam_alloc(const char *user)
+{
+ fstring user2;
+ struct passwd *ret;
+
+ if ( *user == '\0' ) {
+ DEBUG(10,("Get_Pwnam: empty username!\n"));
+ return NULL;
+ }
+
+ fstrcpy(user2, user);
+
+ DEBUG(5,("Finding user %s\n", user));
+
+ ret = Get_Pwnam_internals(user, user2);
+
+ return ret;
+}
+
+/****************************************************************************
+ Get_Pwnam wrapper without modification.
+ NOTE: This with NOT modify 'user'!
+****************************************************************************/
+
+struct passwd *Get_Pwnam(const char *user)
+{
+ struct passwd *ret;
+
+ ret = Get_Pwnam_alloc(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;
+
+ return ret;
+}
+
+/****************************************************************************
+ Check if a user is in a netgroup user list. If at first we don't succeed,
+ try lower case.
+****************************************************************************/
+
+static BOOL user_in_netgroup_list(const char *user, const char *ngname)
+{
+#ifdef HAVE_NETGROUP
+ static char *mydomain = NULL;
+ fstring lowercase_user;
+
+ 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));
+
+ if (innetgr(ngname, NULL, user, mydomain)) {
+ DEBUG(5,("user_in_netgroup_list: Found\n"));
+ return (True);
+ } else {
+
+ /*
+ * Ok, innetgr is case sensitive. Try once more with lowercase
+ * just in case. Attempt to fix #703. JRA.
+ */
+
+ fstrcpy(lowercase_user, user);
+ strlower_m(lowercase_user);
+
+ DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
+ lowercase_user, mydomain, ngname));
+
+ if (innetgr(ngname, NULL, lowercase_user, mydomain)) {
+ DEBUG(5,("user_in_netgroup_list: Found\n"));
+ 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 i;
+ gid_t gid, gid_low, gid_high;
+ BOOL ret = False;
+ static gid_t *groups = NULL;
+ static int num_groups = 0;
+ static fstring last_user = "";
+
+ *winbind_answered = False;
+
+ if ((gid = nametogid(gname)) == (gid_t)-1) {
+ DEBUG(0,("user_in_winbind_group_list: nametogid for group %s "
+ "failed.\n", gname ));
+ goto err;
+ }
+
+ if (!lp_idmap_gid(&gid_low, &gid_high)) {
+ DEBUG(4, ("winbind gid range not configured, therefore %s "
+ "cannot be a winbind group\n", gname));
+ goto err;
+ }
+
+ if (gid < gid_low || gid > gid_high) {
+ DEBUG(4, ("group %s is not a winbind group\n", gname));
+ goto err;
+ }
+
+ /* try to user the last user we looked up */
+ /* otherwise fall back to lookups */
+
+ if ( !strequal( last_user, user ) || !groups )
+ {
+ /* clear any cached information */
+
+ SAFE_FREE(groups);
+ fstrcpy( last_user, "" );
+
+ /*
+ * Get the gid's that this user belongs to.
+ */
+
+ if ((num_groups = winbind_getgroups(user, &groups)) == -1)
+ return False;
+
+ if ( num_groups == -1 )
+ return False;
+
+ if ( num_groups == 0 ) {
+ *winbind_answered = True;
+ return False;
+ }
+
+ /* save the last username */
+
+ fstrcpy( last_user, user );
+
+ }
+ else
+ DEBUG(10,("user_in_winbind_group_list: using cached user "
+ "groups for [%s]\n", user));
+
+ if ( DEBUGLEVEL >= 10 ) {
+ DEBUG(10,("user_in_winbind_group_list: using groups -- "));
+ for ( i=0; i<num_groups; i++ )
+ DEBUGADD(10,("%lu ", (unsigned long)groups[i]));
+ DEBUGADD(10,("\n"));
+ }
+
+ /*
+ * 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.
+ */
+
+ 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.
+****************************************************************************/
+
+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);
+ }
+ }
+
+ 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, gid_t *groups,
+ size_t n_groups)
+{
+ BOOL winbind_answered = False;
+ BOOL ret;
+ gid_t gid;
+ unsigned i;
+
+ gid = nametogid(gname);
+ if (gid == (gid_t)-1)
+ return False;
+
+ if (groups && n_groups > 0) {
+ for (i=0; i < n_groups; i++) {
+ if (groups[i] == gid) {
+ return True;
+ }
+ }
+ return False;
+ }
+
+ /* fallback if we don't yet have the group list */
+
+ 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;
+}
+
+/****************************************************************************
+ Check if a user is in a user list - can check combinations of UNIX
+ and netgroup lists.
+****************************************************************************/
+
+BOOL user_in_list(const char *user,const char **list, gid_t *groups,
+ size_t n_groups)
+{
+ 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, groups,
+ n_groups))
+ return True;
+ } else if (**list == '+') {
+
+ if((*(*list +1)) == '&') {
+ /*
+ * Search UNIX list followed by netgroup.
+ */
+ if(user_in_group_list(user, *list +2, groups,
+ n_groups))
+ 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, groups,
+ n_groups))
+ 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, groups,
+ n_groups))
+ 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;
+ Win2k native mode DCs will return domain
+ local groups; while NT4 or mixed mode 2k
+ DCs will not */
+
+ if ( winbind_lookup_name(domain, groupname,
+ &g_sid, &name_type)
+ && ( name_type==SID_NAME_DOM_GRP ||
+ (strequal(lp_workgroup(), domain) &&
+ name_type==SID_NAME_ALIAS) ) )
+ {
+
+ /* 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);
+}
+
+/* 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;
+
+ if (N <= 0 || offset >= len)
+ return(fn(s));
+
+ for (i=offset;i<(len-(N-1));i++) {
+ char c = s[i];
+ if (!islower_ascii((int)c))
+ continue;
+ s[i] = toupper_ascii(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);
+}
+
projects / samba / blobdiff