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mirror of https://github.com/samba-team/samba.git synced 2025-01-11 05:18:09 +03:00

Remove more uses of "extern struct current_user current_user;".

Use accessor functions to get to this value. Tidies up much of
the user context code. Volker, please look at the changes in smbd/uid.c
to familiarize yourself with these changes as I think they make the
logic in there cleaner.

Cause smbd/posix_acls.c code to look at current user context, not
stored context on the conn struct - allows correct use of these
function calls under a become_root()/unbecome_root() pair.

Jeremy.
This commit is contained in:
Jeremy Allison 2010-03-12 13:56:51 -08:00
parent 31b0417f7d
commit e80ceb1d73
10 changed files with 130 additions and 79 deletions

View File

@ -6752,7 +6752,7 @@ uint32_t map_canon_ace_perms(int snum,
enum security_ace_type *pacl_type,
mode_t perms,
bool directory_ace);
NTSTATUS unpack_nt_owners(int snum, uid_t *puser, gid_t *pgrp, uint32 security_info_sent, const SEC_DESC *psd);
NTSTATUS unpack_nt_owners(connection_struct *conn, uid_t *puser, gid_t *pgrp, uint32 security_info_sent, const SEC_DESC *psd);
SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl);
NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
SEC_DESC **ppdesc);
@ -7116,6 +7116,11 @@ void become_root(void);
void unbecome_root(void);
bool become_user(connection_struct *conn, uint16 vuid);
bool unbecome_user(void);
uid_t get_current_uid(connection_struct *conn);
gid_t get_current_gid(connection_struct *conn);
const UNIX_USER_TOKEN *get_current_utok(connection_struct *conn);
const NT_USER_TOKEN *get_current_nttok(connection_struct *conn);
uint16_t get_current_vuid(connection_struct *conn);
/* The following definitions come from smbd/utmp.c */

View File

@ -1441,16 +1441,6 @@ bool set_delete_on_close(files_struct *fsp, bool delete_on_close, const UNIX_USE
return False;
}
if (fsp->conn->admin_user) {
tok_copy = copy_unix_token(lck, tok);
if (tok_copy == NULL) {
TALLOC_FREE(lck);
return false;
}
tok_copy->uid = (uid_t)0;
tok = tok_copy;
}
set_delete_on_close_lck(lck, delete_on_close, tok);
if (fsp->is_directory) {

View File

@ -751,7 +751,7 @@ NTSTATUS smb_set_nt_acl_nfs4(files_struct *fsp,
if (params.do_chown) {
/* chown logic is a copy/paste from posix_acl.c:set_nt_acl */
NTSTATUS status = unpack_nt_owners(SNUM(fsp->conn), &newUID, &newGID, security_info_sent, psd);
NTSTATUS status = unpack_nt_owners(fsp->conn, &newUID, &newGID, security_info_sent, psd);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(8, ("unpack_nt_owners failed"));
return status;

View File

@ -21,8 +21,6 @@
#include "includes.h"
extern struct current_user current_user;
/****************************************************************************
Run a file if it is a magic script.
****************************************************************************/
@ -332,12 +330,12 @@ static NTSTATUS close_remove_share_mode(files_struct *fsp,
/* Initial delete on close was set and no one else
* wrote a real delete on close. */
if (current_user.vuid != fsp->vuid) {
if (get_current_vuid(conn) != fsp->vuid) {
become_user(conn, fsp->vuid);
became_user = True;
}
fsp->delete_on_close = true;
set_delete_on_close_lck(lck, True, &current_user.ut);
set_delete_on_close_lck(lck, True, get_current_utok(fsp->conn));
if (became_user) {
unbecome_user();
}
@ -389,7 +387,7 @@ static NTSTATUS close_remove_share_mode(files_struct *fsp,
*/
fsp->update_write_time_on_close = false;
if (!unix_token_equal(lck->delete_token, &current_user.ut)) {
if (!unix_token_equal(lck->delete_token, get_current_utok(conn))) {
/* Become the user who requested the delete. */
DEBUG(5,("close_remove_share_mode: file %s. "
@ -955,12 +953,12 @@ static NTSTATUS close_directory(struct smb_request *req, files_struct *fsp,
* directories we don't care if anyone else
* wrote a real delete on close. */
if (current_user.vuid != fsp->vuid) {
if (get_current_vuid(fsp->conn) != fsp->vuid) {
become_user(fsp->conn, fsp->vuid);
became_user = True;
}
send_stat_cache_delete_message(fsp->fsp_name->base_name);
set_delete_on_close_lck(lck, True, &current_user.ut);
set_delete_on_close_lck(lck, True, get_current_utok(fsp->conn));
fsp->delete_on_close = true;
if (became_user) {
unbecome_user();

View File

@ -1129,9 +1129,11 @@ static bool user_can_read_file(connection_struct *conn,
/*
* If user is a member of the Admin group
* we never hide files from them.
* Use (uid_t)0 here not sec_initial_uid()
* because of the RAW-SAMBA3HIDE test.
*/
if (conn->admin_user) {
if (get_current_uid(conn) == (uid_t)0) {
return True;
}
@ -1151,9 +1153,11 @@ static bool user_can_write_file(connection_struct *conn,
/*
* If user is a member of the Admin group
* we never hide files from them.
* Use (uid_t)0 here not sec_initial_uid()
* because of the RAW-SAMBA3HIDE test.
*/
if (conn->admin_user) {
if (get_current_uid(conn) == (uid_t)0) {
return True;
}
@ -1178,10 +1182,13 @@ static bool file_is_special(connection_struct *conn,
/*
* If user is a member of the Admin group
* we never hide files from them.
* Use (uid_t)0 here not sec_initial_uid()
* because of the RAW-SAMBA3HIDE test.
*/
if (conn->admin_user)
if (get_current_uid(conn) == (uid_t)0) {
return False;
}
SMB_ASSERT(VALID_STAT(smb_fname->st));

View File

@ -35,7 +35,7 @@ bool can_access_file_acl(struct connection_struct *conn,
struct security_descriptor *secdesc = NULL;
bool ret;
if (conn->server_info->utok.uid == 0 || conn->admin_user) {
if (get_current_uid(conn) == (uid_t)0) {
/* I'm sorry sir, I didn't know you were root... */
return true;
}
@ -111,7 +111,7 @@ bool can_delete_file_in_directory(connection_struct *conn,
ret = false;
goto out;
}
if (conn->server_info->utok.uid == 0 || conn->admin_user) {
if (get_current_uid(conn) == (uid_t)0) {
/* I'm sorry sir, I didn't know you were root... */
ret = true;
goto out;
@ -195,7 +195,7 @@ bool can_access_file_data(connection_struct *conn,
DEBUG(10,("can_access_file_data: requesting 0x%x on file %s\n",
(unsigned int)access_mask, smb_fname_str_dbg(smb_fname)));
if (conn->server_info->utok.uid == 0 || conn->admin_user) {
if (get_current_uid(conn) == (uid_t)0) {
/* I'm sorry sir, I didn't know you were root... */
return True;
}
@ -203,7 +203,7 @@ bool can_access_file_data(connection_struct *conn,
SMB_ASSERT(VALID_STAT(smb_fname->st));
/* Check primary owner access. */
if (conn->server_info->utok.uid == smb_fname->st.st_ex_uid) {
if (get_current_uid(conn) == smb_fname->st.st_ex_uid) {
switch (access_mask) {
case FILE_READ_DATA:
return (smb_fname->st.st_ex_mode & S_IRUSR) ?

View File

@ -3767,7 +3767,9 @@ static bool api_RNetUserGetInfo(connection_struct *conn, uint16 vuid,
vuser->server_info->sam_account);
}
/* modelled after NTAS 3.51 reply */
SSVAL(p,usri11_priv,conn->admin_user?USER_PRIV_ADMIN:USER_PRIV_USER);
SSVAL(p,usri11_priv,
(get_current_uid(conn) == (uid_t)0)?
USER_PRIV_ADMIN:USER_PRIV_USER);
SIVAL(p,usri11_auth_flags,AF_OP_PRINT); /* auth flags */
SIVALS(p,usri11_password_age,-1); /* password age */
SIVAL(p,usri11_homedir,PTR_DIFF(p2,p)); /* home dir */
@ -3820,7 +3822,8 @@ static bool api_RNetUserGetInfo(connection_struct *conn, uint16 vuid,
memset(p+22,' ',16); /* password */
SIVALS(p,38,-1); /* password age */
SSVAL(p,42,
conn->admin_user?USER_PRIV_ADMIN:USER_PRIV_USER);
(get_current_uid(conn) == (uid_t)0)?
USER_PRIV_ADMIN:USER_PRIV_USER);
SIVAL(p,44,PTR_DIFF(p2,*rdata)); /* home dir */
strlcpy(p2, vuser ? pdb_get_homedir(
vuser->server_info->sam_account) : "",
@ -3971,7 +3974,9 @@ static bool api_WWkstaUserLogon(connection_struct *conn,uint16 vuid,
PACKI(&desc,"W",0); /* code */
PACKS(&desc,"B21",name); /* eff. name */
PACKS(&desc,"B",""); /* pad */
PACKI(&desc,"W", conn->admin_user?USER_PRIV_ADMIN:USER_PRIV_USER);
PACKI(&desc,"W",
(get_current_uid(conn) == (uid_t)0)?
USER_PRIV_ADMIN:USER_PRIV_USER);
PACKI(&desc,"D",0); /* auth flags XXX */
PACKI(&desc,"W",0); /* num logons */
PACKI(&desc,"W",0); /* bad pw count */

View File

@ -76,7 +76,7 @@ NTSTATUS smbd_check_open_rights(struct connection_struct *conn,
*access_granted = 0;
if (conn->server_info->utok.uid == 0 || conn->admin_user) {
if (get_current_uid(conn) == (uid_t)0) {
/* I'm sorry sir, I didn't know you were root... */
*access_granted = access_mask;
if (access_mask & SEC_FLAG_MAXIMUM_ALLOWED) {
@ -2173,7 +2173,7 @@ static NTSTATUS open_file_ntcreate(connection_struct *conn,
new_file_created = True;
}
set_share_mode(lck, fsp, conn->server_info->utok.uid, 0,
set_share_mode(lck, fsp, get_current_uid(conn), 0,
fsp->oplock_type);
/* Handle strange delete on close create semantics. */
@ -2638,7 +2638,7 @@ static NTSTATUS open_directory(connection_struct *conn,
return status;
}
set_share_mode(lck, fsp, conn->server_info->utok.uid, 0, NO_OPLOCK);
set_share_mode(lck, fsp, get_current_uid(conn), 0, NO_OPLOCK);
/* For directories the delete on close bit at open time seems
always to be honored on close... See test 19 in Samba4 BASE-DELETE. */

View File

@ -21,7 +21,6 @@
#include "includes.h"
extern struct current_user current_user;
extern const struct generic_mapping file_generic_mapping;
#undef DBGC_CLASS
@ -1168,7 +1167,9 @@ static mode_t map_nt_perms( uint32 *mask, int type)
Unpack a SEC_DESC into a UNIX owner and group.
****************************************************************************/
NTSTATUS unpack_nt_owners(int snum, uid_t *puser, gid_t *pgrp, uint32 security_info_sent, const SEC_DESC *psd)
NTSTATUS unpack_nt_owners(struct connection_struct *conn,
uid_t *puser, gid_t *pgrp,
uint32 security_info_sent, const SEC_DESC *psd)
{
DOM_SID owner_sid;
DOM_SID grp_sid;
@ -1198,10 +1199,10 @@ NTSTATUS unpack_nt_owners(int snum, uid_t *puser, gid_t *pgrp, uint32 security_i
if (security_info_sent & OWNER_SECURITY_INFORMATION) {
sid_copy(&owner_sid, psd->owner_sid);
if (!sid_to_uid(&owner_sid, puser)) {
if (lp_force_unknown_acl_user(snum)) {
if (lp_force_unknown_acl_user(SNUM(conn))) {
/* this allows take ownership to work
* reasonably */
*puser = current_user.ut.uid;
*puser = get_current_uid(conn);
} else {
DEBUG(3,("unpack_nt_owners: unable to validate"
" owner sid for %s\n",
@ -1221,10 +1222,10 @@ NTSTATUS unpack_nt_owners(int snum, uid_t *puser, gid_t *pgrp, uint32 security_i
if (security_info_sent & GROUP_SECURITY_INFORMATION) {
sid_copy(&grp_sid, psd->group_sid);
if (!sid_to_gid( &grp_sid, pgrp)) {
if (lp_force_unknown_acl_user(snum)) {
if (lp_force_unknown_acl_user(SNUM(conn))) {
/* this allows take group ownership to work
* reasonably */
*pgrp = current_user.ut.gid;
*pgrp = get_current_gid(conn);
} else {
DEBUG(3,("unpack_nt_owners: unable to validate"
" group sid.\n"));
@ -1289,7 +1290,7 @@ static void apply_default_perms(const struct share_params *params,
expensive and will need optimisation. A *lot* of optimisation :-). JRA.
****************************************************************************/
static bool uid_entry_in_group( canon_ace *uid_ace, canon_ace *group_ace )
static bool uid_entry_in_group(connection_struct *conn, canon_ace *uid_ace, canon_ace *group_ace )
{
const char *u_name = NULL;
@ -1302,15 +1303,17 @@ static bool uid_entry_in_group( canon_ace *uid_ace, canon_ace *group_ace )
* if it's the current user, we already have the unix token
* and don't need to do the complex user_in_group_sid() call
*/
if (uid_ace->unix_ug.uid == current_user.ut.uid) {
if (uid_ace->unix_ug.uid == get_current_uid(conn)) {
const UNIX_USER_TOKEN *curr_utok = NULL;
size_t i;
if (group_ace->unix_ug.gid == current_user.ut.gid) {
if (group_ace->unix_ug.gid == get_current_gid(conn)) {
return True;
}
for (i=0; i < current_user.ut.ngroups; i++) {
if (group_ace->unix_ug.gid == current_user.ut.groups[i]) {
curr_utok = get_current_utok(conn);
for (i=0; i < curr_utok->ngroups; i++) {
if (group_ace->unix_ug.gid == curr_utok->groups[i]) {
return True;
}
}
@ -1341,7 +1344,7 @@ static bool uid_entry_in_group( canon_ace *uid_ace, canon_ace *group_ace )
type.
****************************************************************************/
static bool ensure_canon_entry_valid(canon_ace **pp_ace,
static bool ensure_canon_entry_valid(connection_struct *conn, canon_ace **pp_ace,
const struct share_params *params,
const bool is_directory,
const DOM_SID *pfile_owner_sid,
@ -1407,7 +1410,7 @@ static bool ensure_canon_entry_valid(canon_ace **pp_ace,
for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
if (uid_entry_in_group(pace, pace_iter)) {
if (uid_entry_in_group(conn, pace, pace_iter)) {
pace->perms |= pace_iter->perms;
group_matched = True;
}
@ -2057,7 +2060,7 @@ static bool create_canon_ace_lists(files_struct *fsp,
allow entries.
****************************************************************************/
static void process_deny_list( canon_ace **pp_ace_list )
static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
{
canon_ace *ace_list = *pp_ace_list;
canon_ace *curr_ace = NULL;
@ -2162,7 +2165,7 @@ static void process_deny_list( canon_ace **pp_ace_list )
if (allow_ace_p->owner_type == UID_ACE)
continue;
if (uid_entry_in_group( curr_ace, allow_ace_p))
if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
new_perms |= allow_ace_p->perms;
}
@ -2206,7 +2209,7 @@ static void process_deny_list( canon_ace **pp_ace_list )
/* Mask off the deny group perms. */
if (uid_entry_in_group( allow_ace_p, curr_ace))
if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
allow_ace_p->perms &= ~curr_ace->perms;
}
@ -2256,7 +2259,7 @@ static void process_deny_list( canon_ace **pp_ace_list )
/* OR in the group perms. */
if (uid_entry_in_group( curr_ace, allow_ace_p))
if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
curr_ace->perms |= allow_ace_p->perms;
}
}
@ -2368,10 +2371,10 @@ static bool unpack_canon_ace(files_struct *fsp,
*/
print_canon_ace_list( "file ace - before deny", file_ace);
process_deny_list( &file_ace);
process_deny_list(fsp->conn, &file_ace);
print_canon_ace_list( "dir ace - before deny", dir_ace);
process_deny_list( &dir_ace);
process_deny_list(fsp->conn, &dir_ace);
/*
* A well formed POSIX file or default ACL has at least 3 entries, a
@ -2390,7 +2393,7 @@ static bool unpack_canon_ace(files_struct *fsp,
st.st_ex_mode = create_default_mode(fsp, False);
if (!ensure_canon_entry_valid(&file_ace, fsp->conn->params,
if (!ensure_canon_entry_valid(fsp->conn, &file_ace, fsp->conn->params,
fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
free_canon_ace_list(file_ace);
free_canon_ace_list(dir_ace);
@ -2407,7 +2410,7 @@ static bool unpack_canon_ace(files_struct *fsp,
st.st_ex_mode = create_default_mode(fsp, True);
if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp->conn->params,
if (dir_ace && !ensure_canon_entry_valid(fsp->conn, &dir_ace, fsp->conn->params,
fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
free_canon_ace_list(file_ace);
free_canon_ace_list(dir_ace);
@ -2592,7 +2595,7 @@ static canon_ace *canonicalise_acl(struct connection_struct *conn,
* This next call will ensure we have at least a user/group/world set.
*/
if (!ensure_canon_entry_valid(&l_head, conn->params,
if (!ensure_canon_entry_valid(conn, &l_head, conn->params,
S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
psbuf, False))
goto fail;
@ -2636,12 +2639,13 @@ static canon_ace *canonicalise_acl(struct connection_struct *conn,
Check if the current user group list contains a given group.
****************************************************************************/
static bool current_user_in_group(gid_t gid)
static bool current_user_in_group(connection_struct *conn, gid_t gid)
{
int i;
const UNIX_USER_TOKEN *utok = get_current_utok(conn);
for (i = 0; i < current_user.ut.ngroups; i++) {
if (current_user.ut.groups[i] == gid) {
for (i = 0; i < utok->ngroups; i++) {
if (utok->groups[i] == gid) {
return True;
}
}
@ -2662,7 +2666,7 @@ static bool acl_group_override(connection_struct *conn,
/* file primary group == user primary or supplementary group */
if (lp_acl_group_control(SNUM(conn)) &&
current_user_in_group(smb_fname->st.st_ex_gid)) {
current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
return true;
}
@ -3540,13 +3544,13 @@ int try_chown(connection_struct *conn, struct smb_filename *smb_fname,
/* Case (2) / (3) */
if (lp_enable_privileges()) {
bool has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
bool has_take_ownership_priv = user_has_privileges(get_current_nttok(conn),
&se_take_ownership);
bool has_restore_priv = user_has_privileges(current_user.nt_user_token,
bool has_restore_priv = user_has_privileges(get_current_nttok(conn),
&se_restore);
/* Case (2) */
if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) ||
if ( ( has_take_ownership_priv && ( uid == get_current_uid(conn) ) ) ||
/* Case (3) */
( has_restore_priv ) ) {
@ -3574,7 +3578,7 @@ int try_chown(connection_struct *conn, struct smb_filename *smb_fname,
and also copes with the case where the SID in a take ownership ACL is
a local SID on the users workstation
*/
if (uid != current_user.ut.uid) {
if (uid != get_current_uid(conn)) {
errno = EPERM;
return -1;
}
@ -3860,7 +3864,7 @@ NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const SEC_DESC
* Unpack the user/group/world id's.
*/
status = unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd);
status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
if (!NT_STATUS_IS_OK(status)) {
return status;
}

View File

@ -167,6 +167,9 @@ static bool check_user_ok(connection_struct *conn,
conn->read_only = readonly_share;
conn->admin_user = admin_user;
if (conn->admin_user) {
conn->server_info->utok.uid = sec_initial_uid();
}
return(True);
}
@ -278,26 +281,22 @@ bool change_to_user(connection_struct *conn, uint16 vuid)
return false;
}
/* security = share sets force_user. */
if (!conn->force_user && !vuser) {
DEBUG(2,("change_to_user: Invalid vuid used %d in accessing "
"share %s.\n",vuid, lp_servicename(snum) ));
return False;
}
/*
* conn->server_info is now correctly set up with a copy we can mess
* with for force_group etc.
*/
if (conn->force_user) /* security = share sets this too */ {
uid = conn->server_info->utok.uid;
gid = conn->server_info->utok.gid;
group_list = conn->server_info->utok.groups;
num_groups = conn->server_info->utok.ngroups;
} else if (vuser) {
uid = conn->admin_user ? 0 : vuser->server_info->utok.uid;
gid = conn->server_info->utok.gid;
num_groups = conn->server_info->utok.ngroups;
group_list = conn->server_info->utok.groups;
} else {
DEBUG(2,("change_to_user: Invalid vuid used %d in accessing "
"share %s.\n",vuid, lp_servicename(snum) ));
return False;
}
uid = conn->server_info->utok.uid;
gid = conn->server_info->utok.gid;
num_groups = conn->server_info->utok.ngroups;
group_list = conn->server_info->utok.groups;
/*
* See if we should force group for this service.
@ -342,7 +341,7 @@ bool change_to_user(connection_struct *conn, uint16 vuid)
set_sec_ctx() */
current_user.ut.ngroups = num_groups;
current_user.ut.groups = group_list;
current_user.ut.groups = group_list;
set_sec_ctx(uid, gid, current_user.ut.ngroups, current_user.ut.groups,
conn->server_info->ptok);
@ -505,3 +504,46 @@ bool unbecome_user(void)
pop_conn_ctx();
return True;
}
/****************************************************************************
Return the current user we are running effectively as on this connection.
I'd like to make this return conn->server_info->utok.uid, but become_root()
doesn't alter this value.
****************************************************************************/
uid_t get_current_uid(connection_struct *conn)
{
return current_user.ut.uid;
}
/****************************************************************************
Return the current group we are running effectively as on this connection.
I'd like to make this return conn->server_info->utok.gid, but become_root()
doesn't alter this value.
****************************************************************************/
gid_t get_current_gid(connection_struct *conn)
{
return current_user.ut.gid;
}
/****************************************************************************
Return the UNIX token we are running effectively as on this connection.
I'd like to make this return &conn->server_info->utok, but become_root()
doesn't alter this value.
****************************************************************************/
const UNIX_USER_TOKEN *get_current_utok(connection_struct *conn)
{
return &current_user.ut;
}
const NT_USER_TOKEN *get_current_nttok(connection_struct *conn)
{
return current_user.nt_user_token;
}
uint16_t get_current_vuid(connection_struct *conn)
{
return current_user.vuid;
}