/*
* Take a user, uid and gid and return a faked up passwd struct.
*/
struct passwd *
sudo_fakepwnamid(const char *user, uid_t uid, gid_t gid)
{
struct cache_item_pw *pwitem;
struct passwd *pw;
struct rbnode *node;
size_t len, namelen;
int i;
debug_decl(sudo_fakepwnam, SUDO_DEBUG_NSS)
namelen = strlen(user);
len = sizeof(*pwitem) + namelen + 1 /* pw_name */ +
sizeof("*") /* pw_passwd */ + sizeof("") /* pw_gecos */ +
sizeof("/") /* pw_dir */ + sizeof(_PATH_BSHELL);
for (i = 0; i < 2; i++) {
pwitem = ecalloc(1, len);
pw = &pwitem->pw;
pw->pw_uid = uid;
pw->pw_gid = gid;
pw->pw_name = (char *)(pwitem + 1);
memcpy(pw->pw_name, user, namelen + 1);
pw->pw_passwd = pw->pw_name + namelen + 1;
memcpy(pw->pw_passwd, "*", 2);
pw->pw_gecos = pw->pw_passwd + 2;
pw->pw_gecos[0] = '\0';
pw->pw_dir = pw->pw_gecos + 1;
memcpy(pw->pw_dir, "/", 2);
pw->pw_shell = pw->pw_dir + 2;
memcpy(pw->pw_shell, _PATH_BSHELL, sizeof(_PATH_BSHELL));
pwitem->cache.refcnt = 1;
pwitem->cache.d.pw = pw;
if (i == 0) {
/* Store by uid, overwriting cached version. */
pwitem->cache.k.uid = pw->pw_uid;
if ((node = rbinsert(pwcache_byuid, &pwitem->cache)) != NULL) {
sudo_pw_delref_item(node->data);
node->data = &pwitem->cache;
}
} else {
/* Store by name, overwriting cached version. */
pwitem->cache.k.name = pw->pw_name;
if ((node = rbinsert(pwcache_byname, &pwitem->cache)) != NULL) {
sudo_pw_delref_item(node->data);
node->data = &pwitem->cache;
}
}
}
pwitem->cache.refcnt++;
debug_return_ptr(pw);
}
void
sudo_pw_delref(struct passwd *pw)
{
debug_decl(sudo_pw_delref, SUDO_DEBUG_NSS)
sudo_pw_delref_item(ptr_to_item(pw));
debug_return;
}
/*
* Take a user, uid, gid, home and shell and return a faked up passwd struct.
* If home or shell are NULL default values will be used.
*/
struct passwd *
sudo_mkpwent(const char *user, uid_t uid, gid_t gid, const char *home,
const char *shell)
{
struct cache_item_pw *pwitem;
struct cache_item *item;
struct passwd *pw;
size_t len, name_len, home_len, shell_len;
int i;
debug_decl(sudo_mkpwent, SUDOERS_DEBUG_NSS)
/* Optional arguments. */
if (home == NULL)
home = "/";
if (shell == NULL)
shell = _PATH_BSHELL;
name_len = strlen(user);
home_len = strlen(home);
shell_len = strlen(shell);
len = sizeof(*pwitem) + name_len + 1 /* pw_name */ +
sizeof("*") /* pw_passwd */ + sizeof("") /* pw_gecos */ +
home_len + 1 /* pw_dir */ + shell_len + 1 /* pw_shell */;
for (i = 0; i < 2; i++) {
struct rbtree *pwcache;
struct rbnode *node;
pwitem = sudo_ecalloc(1, len);
pw = &pwitem->pw;
pw->pw_uid = uid;
pw->pw_gid = gid;
pw->pw_name = (char *)(pwitem + 1);
memcpy(pw->pw_name, user, name_len + 1);
pw->pw_passwd = pw->pw_name + name_len + 1;
memcpy(pw->pw_passwd, "*", 2);
pw->pw_gecos = pw->pw_passwd + 2;
pw->pw_gecos[0] = '\0';
pw->pw_dir = pw->pw_gecos + 1;
memcpy(pw->pw_dir, home, home_len + 1);
pw->pw_shell = pw->pw_dir + home_len + 1;
memcpy(pw->pw_shell, shell, shell_len + 1);
item = &pwitem->cache;
item->refcnt = 1;
item->d.pw = pw;
if (i == 0) {
/* Store by uid if it doesn't already exist. */
item->k.uid = pw->pw_uid;
pwcache = pwcache_byuid;
} else {
/* Store by name if it doesn't already exist. */
item->k.name = pw->pw_name;
pwcache = pwcache_byname;
}
if ((node = rbinsert(pwcache, item)) != NULL) {
/* Already exists. */
item = node->data;
if (item->d.pw == NULL) {
/* Negative cache entry, replace with ours. */
sudo_pw_delref_item(item);
item = node->data = &pwitem->cache;
} else {
/* Good entry, discard our fake one. */
sudo_efree(pwitem);
}
}
}
item->refcnt++;
debug_return_ptr(item->d.pw);
}
