/*
- Unix SMB/Netbios implementation.
- Version 1.9.
+ Unix SMB/CIFS implementation.
uid/user 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
+ 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,
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"
/* what user is current? */
extern struct current_user current_user;
+/****************************************************************************
+ Iterator functions for getting all gid's from current_user.
+****************************************************************************/
+
+gid_t get_current_user_gid_first(int *piterator)
+{
+ *piterator = 0;
+ return current_user.ut.gid;
+}
+
+gid_t get_current_user_gid_next(int *piterator)
+{
+ gid_t ret;
+
+ if (!current_user.ut.groups || *piterator >= current_user.ut.ngroups) {
+ return (gid_t)-1;
+ }
+
+ ret = current_user.ut.groups[*piterator];
+ (*piterator) += 1;
+ return ret;
+}
+
/****************************************************************************
Become the guest user without changing the security context stack.
****************************************************************************/
-BOOL change_to_guest(void)
+bool change_to_guest(void)
{
static struct passwd *pass=NULL;
if (!pass) {
/* Don't need to free() this as its stored in a static */
- pass = getpwnam_alloc(lp_guestaccount());
+ pass = getpwnam_alloc(NULL, lp_guestaccount());
if (!pass)
return(False);
}
current_user.conn = NULL;
current_user.vuid = UID_FIELD_INVALID;
+
+ TALLOC_FREE(pass);
+ pass = NULL;
return True;
}
Check if a username is OK.
********************************************************************/
-static BOOL check_user_ok(connection_struct *conn, user_struct *vuser,int snum)
+static bool check_user_ok(connection_struct *conn, user_struct *vuser,int snum)
{
- int i;
- for (i=0;i<conn->uid_cache.entries;i++)
- if (conn->uid_cache.list[i] == vuser->uid)
+ unsigned int i;
+ struct vuid_cache_entry *ent = NULL;
+ bool readonly_share;
+ NT_USER_TOKEN *token;
+
+ for (i=0;i<conn->vuid_cache.entries && i< VUID_CACHE_SIZE;i++) {
+ if (conn->vuid_cache.array[i].vuid == vuser->vuid) {
+ ent = &conn->vuid_cache.array[i];
+ conn->read_only = ent->read_only;
+ conn->admin_user = ent->admin_user;
return(True);
+ }
+ }
- if (!user_ok(vuser->user.unix_name,snum))
+ if (!user_ok_token(vuser->user.unix_name, vuser->nt_user_token, snum))
return(False);
- i = conn->uid_cache.entries % UID_CACHE_SIZE;
- conn->uid_cache.list[i] = vuser->uid;
+ readonly_share = is_share_read_only_for_token(vuser->user.unix_name,
+ vuser->nt_user_token,
+ SNUM(conn));
+
+ token = conn->nt_user_token ?
+ conn->nt_user_token : vuser->nt_user_token;
+
+ if (!readonly_share &&
+ !share_access_check(token, lp_servicename(snum),
+ FILE_WRITE_DATA)) {
+ /* smb.conf allows r/w, but the security descriptor denies
+ * write. Fall back to looking at readonly. */
+ readonly_share = True;
+ DEBUG(5,("falling back to read-only access-evaluation due to "
+ "security descriptor\n"));
+ }
+
+ if (!share_access_check(token, lp_servicename(snum),
+ readonly_share ?
+ FILE_READ_DATA : FILE_WRITE_DATA)) {
+ return False;
+ }
+
+ i = conn->vuid_cache.entries % VUID_CACHE_SIZE;
+ if (conn->vuid_cache.entries < VUID_CACHE_SIZE)
+ conn->vuid_cache.entries++;
+
+ ent = &conn->vuid_cache.array[i];
+ ent->vuid = vuser->vuid;
+ ent->read_only = readonly_share;
+
+ ent->admin_user = token_contains_name_in_list(
+ vuser->user.unix_name, NULL, vuser->nt_user_token,
+ lp_admin_users(SNUM(conn)));
- if (conn->uid_cache.entries < UID_CACHE_SIZE)
- conn->uid_cache.entries++;
+ conn->read_only = ent->read_only;
+ conn->admin_user = ent->admin_user;
return(True);
}
/****************************************************************************
Become the user of a connection number without changing the security context
- stack, but modify the currnet_user entries.
+ stack, but modify the current_user entries.
****************************************************************************/
-BOOL change_to_user(connection_struct *conn, uint16 vuid)
+bool change_to_user(connection_struct *conn, uint16 vuid)
{
user_struct *vuser = get_valid_user_struct(vuid);
int snum;
gid_t gid;
uid_t uid;
char group_c;
- BOOL must_free_token = False;
+ bool must_free_token = False;
NT_USER_TOKEN *token = NULL;
-
+ int num_groups = 0;
+ gid_t *group_list = NULL;
+
if (!conn) {
DEBUG(2,("change_to_user: Connection not open\n"));
return(False);
*/
if((lp_security() == SEC_SHARE) && (current_user.conn == conn) &&
- (current_user.uid == conn->uid)) {
- DEBUG(4,("change_to_user: Skipping user change - already user\n"));
+ (current_user.ut.uid == conn->uid)) {
+ DEBUG(4,("change_to_user: Skipping user change - already "
+ "user\n"));
return(True);
} else if ((current_user.conn == conn) &&
(vuser != 0) && (current_user.vuid == vuid) &&
- (current_user.uid == vuser->uid)) {
- DEBUG(4,("change_to_user: Skipping user change - already user\n"));
+ (current_user.ut.uid == vuser->uid)) {
+ DEBUG(4,("change_to_user: Skipping user change - already "
+ "user\n"));
return(True);
}
snum = SNUM(conn);
- if((vuser != NULL) && !check_user_ok(conn, vuser, snum))
+ if ((vuser) && !check_user_ok(conn, vuser, snum)) {
+ DEBUG(2,("change_to_user: SMB user %s (unix user %s, vuid %d) "
+ "not permitted access to share %s.\n",
+ vuser->user.smb_name, vuser->user.unix_name, vuid,
+ lp_servicename(snum)));
return False;
+ }
- if (conn->force_user ||
- conn->admin_user ||
- (lp_security() == SEC_SHARE)) {
+ if (conn->force_user) /* security = share sets this too */ {
uid = conn->uid;
gid = conn->gid;
- current_user.groups = conn->groups;
- current_user.ngroups = conn->ngroups;
+ group_list = conn->groups;
+ num_groups = conn->ngroups;
token = conn->nt_user_token;
- } else {
- if (!vuser) {
- DEBUG(2,("change_to_user: Invalid vuid used %d\n",vuid));
- return(False);
- }
- uid = vuser->uid;
+ } else if (vuser) {
+ uid = conn->admin_user ? 0 : vuser->uid;
gid = vuser->gid;
- current_user.ngroups = vuser->n_groups;
- current_user.groups = vuser->groups;
+ num_groups = vuser->n_groups;
+ group_list = vuser->groups;
token = vuser->nt_user_token;
+ } else {
+ DEBUG(2,("change_to_user: Invalid vuid used %d in accessing "
+ "share %s.\n",vuid, lp_servicename(snum) ));
+ return False;
}
/*
*/
if((group_c = *lp_force_group(snum))) {
- BOOL is_guest = False;
+
+ token = dup_nt_token(NULL, token);
+ if (token == NULL) {
+ DEBUG(0, ("dup_nt_token failed\n"));
+ return False;
+ }
+ must_free_token = True;
if(group_c == '+') {
*/
int i;
- for (i = 0; i < current_user.ngroups; i++) {
- if (current_user.groups[i] == conn->gid) {
+ for (i = 0; i < num_groups; i++) {
+ if (group_list[i] == conn->gid) {
gid = conn->gid;
+ gid_to_sid(&token->user_sids[1], gid);
break;
}
}
} else {
gid = conn->gid;
+ gid_to_sid(&token->user_sids[1], gid);
}
-
- /*
- * We've changed the group list in the token - we must
- * re-create it.
- */
-
- if (vuser && vuser->guest)
- is_guest = True;
-
- token = create_nt_token(uid, gid, current_user.ngroups, current_user.groups, is_guest, NULL);
- must_free_token = True;
}
- set_sec_ctx(uid, gid, current_user.ngroups, current_user.groups, token);
+ /* Now set current_user since we will immediately also call
+ set_sec_ctx() */
+
+ current_user.ut.ngroups = num_groups;
+ current_user.ut.groups = group_list;
+
+ set_sec_ctx(uid, gid, current_user.ut.ngroups, current_user.ut.groups,
+ token);
/*
* Free the new token (as set_sec_ctx copies it).
*/
if (must_free_token)
- delete_nt_token(&token);
+ TALLOC_FREE(token);
current_user.conn = conn;
current_user.vuid = vuid;
but modify the current_user entries.
****************************************************************************/
-BOOL change_to_root_user(void)
+bool change_to_root_user(void)
{
set_root_sec_ctx();
user. Doesn't modify current_user.
****************************************************************************/
-BOOL become_authenticated_pipe_user(pipes_struct *p)
+bool become_authenticated_pipe_user(pipes_struct *p)
{
if (!push_sec_ctx())
return False;
- set_sec_ctx(p->pipe_user.uid, p->pipe_user.gid,
- p->pipe_user.ngroups, p->pipe_user.groups, p->pipe_user.nt_user_token);
+ set_sec_ctx(p->pipe_user.ut.uid, p->pipe_user.ut.gid,
+ p->pipe_user.ut.ngroups, p->pipe_user.ut.groups,
+ p->pipe_user.nt_user_token);
return True;
}
current_user.
****************************************************************************/
-BOOL unbecome_authenticated_pipe_user(void)
+bool unbecome_authenticated_pipe_user(void)
{
return pop_sec_ctx();
}
ctx_p->vuid = UID_FIELD_INVALID;
}
-void init_conn_ctx(void)
-{
- int i;
-
- /* Initialise connection context stack */
- for (i = 0; i < MAX_SEC_CTX_DEPTH; i++) {
- conn_ctx_stack[i].conn = NULL;
- conn_ctx_stack[i].vuid = UID_FIELD_INVALID;
- }
-}
-
/****************************************************************************
Temporarily become a root user. Must match with unbecome_root(). Saves and
restores the connection context.
Saves and restores the connection context.
****************************************************************************/
-BOOL become_user(connection_struct *conn, uint16 vuid)
+bool become_user(connection_struct *conn, uint16 vuid)
{
if (!push_sec_ctx())
return False;
return True;
}
-BOOL unbecome_user(void)
+bool unbecome_user(void)
{
pop_sec_ctx();
pop_conn_ctx();
return True;
}
-
-/*****************************************************************
- Convert the suplimentary SIDs returned in a netlogon into UNIX
- group gid_t's. Add to the total group array.
-*****************************************************************/
-
-void add_supplementary_nt_login_groups(int *n_groups, gid_t **pp_groups, NT_USER_TOKEN **pptok)
-{
- int total_groups;
- int current_n_groups = *n_groups;
- gid_t *final_groups = NULL;
- size_t i;
- NT_USER_TOKEN *ptok = *pptok;
- NT_USER_TOKEN *new_tok = NULL;
-
- if (!ptok || (ptok->num_sids == 0))
- return;
-
- new_tok = dup_nt_token(ptok);
- if (!new_tok) {
- DEBUG(0,("add_supplementary_nt_login_groups: Failed to malloc new token\n"));
- return;
- }
- /* Leave the allocated space but empty the number of SIDs. */
- new_tok->num_sids = 0;
-
- total_groups = current_n_groups + ptok->num_sids;
-
- final_groups = (gid_t *)malloc(total_groups * sizeof(gid_t));
- if (!final_groups) {
- DEBUG(0,("add_supplementary_nt_login_groups: Failed to malloc new groups.\n"));
- delete_nt_token(&new_tok);
- return;
- }
-
- memcpy(final_groups, *pp_groups, current_n_groups * sizeof(gid_t));
- for (i = 0; i < ptok->num_sids; i++) {
- enum SID_NAME_USE sid_type;
- gid_t new_grp;
-
- if (sid_to_gid(&ptok->user_sids[i], &new_grp, &sid_type)) {
- /*
- * Don't add the gid_t if it is already in the current group
- * list. Some UNIXen don't like the same group more than once.
- */
- int j;
-
- for (j = 0; j < current_n_groups; j++)
- if (final_groups[j] == new_grp)
- break;
-
- if ( j == current_n_groups) {
- /* Group not already present. */
- final_groups[current_n_groups++] = new_grp;
- }
- } else {
- /* SID didn't map. Copy to the new token to be saved. */
- sid_copy(&new_tok->user_sids[new_tok->num_sids++], &ptok->user_sids[i]);
- }
- }
-
- SAFE_FREE(*pp_groups);
- *pp_groups = final_groups;
- *n_groups = current_n_groups;
-
- /* Replace the old token with the truncated one. */
- delete_nt_token(&ptok);
- *pptok = new_tok;
-}
-
-/*****************************************************************
- *THE CANONICAL* convert name to SID function.
- Tries winbind first - then uses local lookup.
-*****************************************************************/
-
-BOOL lookup_name(const char *name, DOM_SID *psid, enum SID_NAME_USE *name_type)
-{
- extern pstring global_myname;
- extern fstring global_myworkgroup;
- fstring sid;
- char *sep = lp_winbind_separator();
-
- *name_type = SID_NAME_UNKNOWN;
-
- if (!winbind_lookup_name(name, psid, name_type) || (*name_type != SID_NAME_USER) ) {
- BOOL ret = False;
-
- DEBUG(10, ("lookup_name: winbind lookup for %s failed - trying local\n", name));
-
- /* If we are looking up a domain user, make sure it is
- for the local machine only */
-
- if (strchr_m(name, sep[0]) || strchr_m(name, '\\') || lp_winbind_use_default_domain()) {
- fstring domain, username;
-
- split_domain_name(name, domain, username);
-
- switch (lp_server_role()) {
- case ROLE_DOMAIN_PDC:
- case ROLE_DOMAIN_BDC:
- if (strequal(domain, global_myworkgroup)) {
- fstrcpy(domain, global_myname);
- ret = local_lookup_name(domain, username, psid, name_type);
- }
- /* No break is deliberate here. JRA. */
- default:
- if (strcasecmp(global_myname, domain) != 0) {
- DEBUG(5, ("lookup_name: domain %s is not local\n", domain));
- ret = local_lookup_name(global_myname, username, psid, name_type);
- }
- }
- } else {
- ret = local_lookup_name(global_myname, name, psid, name_type);
- }
-
- if (ret) {
- DEBUG(10,
- ("lookup_name: (local) %s -> SID %s (type %u)\n",
- name, sid_to_string(sid,psid),
- (unsigned int)*name_type ));
- } else {
- DEBUG(10,("lookup name: (local) %s failed.\n", name));
- }
-
- return ret;
- }
-
- DEBUG(10,("lookup_name (winbindd): %s -> SID %s (type %u)\n",
- name, sid_to_string(sid, psid),
- (unsigned int)*name_type));
- return True;
-}
-
-/*****************************************************************
- *THE CANONICAL* convert SID to name function.
- Tries winbind first - then uses local lookup.
-*****************************************************************/
-
-BOOL lookup_sid(DOM_SID *sid, fstring dom_name, fstring name, enum SID_NAME_USE *name_type)
-{
- if (!name_type)
- return False;
-
- *name_type = SID_NAME_UNKNOWN;
-
- /* Check if this is our own sid. This should perhaps be done by
- winbind? For the moment handle it here. */
-
- if (sid->num_auths == 5) {
- DOM_SID tmp_sid;
- uint32 rid;
-
- sid_copy(&tmp_sid, sid);
- sid_split_rid(&tmp_sid, &rid);
-
- if (sid_equal(&global_sam_sid, &tmp_sid)) {
-
- return map_domain_sid_to_name(&tmp_sid, dom_name) &&
- local_lookup_sid(sid, name, name_type);
- }
- }
-
- if (!winbind_lookup_sid(sid, dom_name, name, name_type)) {
- fstring sid_str;
- DOM_SID tmp_sid;
- uint32 rid;
-
- DEBUG(10,("lookup_sid: winbind lookup for SID %s failed - trying local.\n", sid_to_string(sid_str, sid) ));
-
- sid_copy(&tmp_sid, sid);
- sid_split_rid(&tmp_sid, &rid);
- return map_domain_sid_to_name(&tmp_sid, dom_name) &&
- lookup_known_rid(&tmp_sid, rid, name, name_type);
- }
- return True;
-}
-
-/*****************************************************************
- *THE CANONICAL* convert uid_t to SID function.
- Tries winbind first - then uses local lookup.
- Returns SID pointer.
-*****************************************************************/
-
-DOM_SID *uid_to_sid(DOM_SID *psid, uid_t uid)
-{
- uid_t low, high;
- fstring sid;
-
- if (lp_winbind_uid(&low, &high) && uid >= low && uid <= high) {
- if (winbind_uid_to_sid(psid, uid)) {
-
- DEBUG(10,("uid_to_sid: winbindd %u -> %s\n",
- (unsigned int)uid, sid_to_string(sid, psid)));
-
- return psid;
- }
- }
-
- local_uid_to_sid(psid, uid);
-
- DEBUG(10,("uid_to_sid: local %u -> %s\n", (unsigned int)uid, sid_to_string(sid, psid)));
-
- return psid;
-}
-
-/*****************************************************************
- *THE CANONICAL* convert gid_t to SID function.
- Tries winbind first - then uses local lookup.
- Returns SID pointer.
-*****************************************************************/
-
-DOM_SID *gid_to_sid(DOM_SID *psid, gid_t gid)
-{
- gid_t low, high;
- fstring sid;
-
- if (lp_winbind_gid(&low, &high) && gid >= low && gid <= high) {
- if (winbind_gid_to_sid(psid, gid)) {
-
- DEBUG(10,("gid_to_sid: winbindd %u -> %s\n",
- (unsigned int)gid, sid_to_string(sid, psid)));
-
- return psid;
- }
- }
-
- local_gid_to_sid(psid, gid);
-
- DEBUG(10,("gid_to_sid: local %u -> %s\n", (unsigned int)gid, sid_to_string(sid, psid)));
-
- return psid;
-}
-
-/*****************************************************************
- *THE CANONICAL* convert SID to uid function.
- Tries winbind first - then uses local lookup.
- Returns True if this name is a user sid and the conversion
- was done correctly, False if not. sidtype is set by this function.
-*****************************************************************/
-
-BOOL sid_to_uid(DOM_SID *psid, uid_t *puid, enum SID_NAME_USE *sidtype)
-{
- fstring dom_name, name, sid_str;
- enum SID_NAME_USE name_type;
-
- *sidtype = SID_NAME_UNKNOWN;
-
- /*
- * First we must look up the name and decide if this is a user sid.
- */
-
- if ( (!winbind_lookup_sid(psid, dom_name, name, &name_type)) || (name_type != SID_NAME_USER) ) {
- DEBUG(10,("sid_to_uid: winbind lookup for sid %s failed - trying local.\n",
- sid_to_string(sid_str, psid) ));
-
- return local_sid_to_uid(puid, psid, sidtype);
- }
-
- /*
- * Ensure this is a user sid.
- */
-
- if (name_type != SID_NAME_USER) {
- DEBUG(10,("sid_to_uid: winbind lookup succeeded but SID is not a uid (%u)\n",
- (unsigned int)name_type ));
- return False;
- }
-
- *sidtype = SID_NAME_USER;
-
- /*
- * Get the uid for this SID.
- */
-
- if (!winbind_sid_to_uid(puid, psid)) {
- DEBUG(10,("sid_to_uid: winbind lookup for sid %s failed.\n",
- sid_to_string(sid_str, psid) ));
- return False;
- }
-
- DEBUG(10,("sid_to_uid: winbindd %s -> %u\n",
- sid_to_string(sid_str, psid),
- (unsigned int)*puid ));
-
- return True;
-}
-
-/*****************************************************************
- *THE CANONICAL* convert SID to gid function.
- Tries winbind first - then uses local lookup.
- Returns True if this name is a user sid and the conversion
- was done correctly, False if not.
-*****************************************************************/
-
-BOOL sid_to_gid(DOM_SID *psid, gid_t *pgid, enum SID_NAME_USE *sidtype)
-{
- fstring dom_name, name, sid_str;
- enum SID_NAME_USE name_type;
-
- *sidtype = SID_NAME_UNKNOWN;
-
- /*
- * First we must look up the name and decide if this is a group sid.
- */
-
- if (!winbind_lookup_sid(psid, dom_name, name, &name_type)) {
- DEBUG(10,("sid_to_gid: winbind lookup for sid %s failed - trying local.\n",
- sid_to_string(sid_str, psid) ));
-
- return local_sid_to_gid(pgid, psid, sidtype);
- }
-
- /*
- * Ensure this is a group sid.
- */
-
- if ((name_type != SID_NAME_DOM_GRP) && (name_type != SID_NAME_ALIAS) && (name_type != SID_NAME_WKN_GRP)) {
- DEBUG(10,("sid_to_gid: winbind lookup succeeded but SID is not a known group (%u)\n",
- (unsigned int)name_type ));
-
- return local_sid_to_gid(pgid, psid, sidtype);
- }
-
- *sidtype = name_type;
-
- /*
- * Get the gid for this SID.
- */
-
- if (!winbind_sid_to_gid(pgid, psid)) {
- DEBUG(10,("sid_to_gid: winbind lookup for sid %s failed.\n",
- sid_to_string(sid_str, psid) ));
- return False;
- }
-
- DEBUG(10,("sid_to_gid: winbindd %s -> %u\n",
- sid_to_string(sid_str, psid),
- (unsigned int)*pgid ));
-
- return True;
-}