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Fixed memory leak with NT tokens.

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Added debug messages to se_access_check().
Added FULL_ACCESS acl to default acl on printers.
Jeremy.
(This used to be commit 7507f6f408)
This commit is contained in:
Jeremy Allison 2000-08-09 18:40:48 +00:00
parent fadb15da71
commit e3048cfc0b
4 changed files with 103 additions and 50 deletions
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17
source3/lib/util_seaccess.c
View File

@ -212,6 +212,9 @@ BOOL se_access_check(SEC_DESC *sd, struct current_user *user,
*status = NT_STATUS_NOPROBLEMO;
*acc_granted = 0;
DEBUG(10,("se_access_check: requested access %x, for uid %u\n",
(unsigned int)acc_desired, (unsigned int)user->uid ));
/*
* No security descriptor or security descriptor with no DACL
* present allows all access.
@ -222,7 +225,7 @@ BOOL se_access_check(SEC_DESC *sd, struct current_user *user,
if (!sd || (sd && (!(sd->type & SEC_DESC_DACL_PRESENT) || sd->dacl == NULL))) {
*status = NT_STATUS_NOPROBLEMO;
*acc_granted = acc_desired;
DEBUG(3, ("se_access_check: no sd or blank DACL, access allowed\n"));
DEBUG(5, ("se_access_check: no sd or blank DACL, access allowed\n"));
return True;
}
@ -233,6 +236,7 @@ BOOL se_access_check(SEC_DESC *sd, struct current_user *user,
DEBUG(1, ("no owner for security descriptor\n"));
*acc_granted = 0;
*status = NT_STATUS_ACCESS_DENIED;
DEBUG(5, ("se_access_check: no owner sid, access denied\n"));
return False;
}
@ -260,9 +264,16 @@ BOOL se_access_check(SEC_DESC *sd, struct current_user *user,
}
for ( i = 0 ; i < acl->num_aces && tmp_acc_desired != 0; i++) {
tmp_acc_desired = check_ace( &acl->ace[i], token, tmp_acc_desired, status);
SEC_ACE *ace = &acl->ace[i];
DEBUG(10,("se_access_check: ACE %u: SID = %s mask = %x, current desired = %x\n",
(unsigned int)i, sid_to_string(sid_str, &ace->sid),
(unsigned int) ace->info.mask, (unsigned int)tmp_acc_desired ));
tmp_acc_desired = check_ace( ace, token, tmp_acc_desired, status);
if (*status != NT_STATUS_NOPROBLEMO) {
*acc_granted = 0;
DEBUG(5,("se_access_check: ACE %u denied with status %x.\n", (unsigned int)i, (unsigned int)*status ));
return False;
}
}
@ -275,10 +286,12 @@ BOOL se_access_check(SEC_DESC *sd, struct current_user *user,
if (tmp_acc_desired == 0) {
*acc_granted = acc_desired;
*status = NT_STATUS_NOPROBLEMO;
DEBUG(5,("se_access_check: access (%x) granted.\n", (unsigned int)acc_desired ));
return True;
}
*acc_granted = 0;
*status = NT_STATUS_ACCESS_DENIED;
DEBUG(5,("se_access_check: access (%x) denied.\n", (unsigned int)acc_desired ));
return False;
}

39
source3/printing/nt_printing.c
View File

@ -417,6 +417,7 @@ BOOL move_driver_to_download_area(NT_PRINTER_DRIVER_INFO_LEVEL driver_abstract,
unbecome_root();
return False;
}
unbecome_root();
/* Null password is ok - we are already an authenticated user... */
*null_pw = '\0';
@ -424,13 +425,18 @@ BOOL move_driver_to_download_area(NT_PRINTER_DRIVER_INFO_LEVEL driver_abstract,
if (conn == NULL) {
DEBUG(0,("move_driver_to_download_area: Unable to connect\n"));
unbecome_root();
return False;
}
/*
* Save who we are - we are temporarily becoming the connection user.
*/
push_sec_ctx();
if (!become_user(conn, conn->vuid)) {
DEBUG(0,("move_driver_to_download_area: Can't become user %s\n", user_name ));
unbecome_root();
pop_sec_ctx();
return False;
}
@ -461,7 +467,7 @@ BOOL move_driver_to_download_area(NT_PRINTER_DRIVER_INFO_LEVEL driver_abstract,
DEBUG(0,("move_driver_to_download_area: Unable to rename %s to %s\n",
old_name, new_name ));
close_cnum(conn, user->vuid);
unbecome_root();
pop_sec_ctx();
return False;
}
@ -472,7 +478,7 @@ BOOL move_driver_to_download_area(NT_PRINTER_DRIVER_INFO_LEVEL driver_abstract,
DEBUG(0,("move_driver_to_download_area: Unable to rename %s to %s\n",
old_name, new_name ));
close_cnum(conn, user->vuid);
unbecome_root();
pop_sec_ctx();
return False;
}
}
@ -485,7 +491,7 @@ BOOL move_driver_to_download_area(NT_PRINTER_DRIVER_INFO_LEVEL driver_abstract,
DEBUG(0,("move_driver_to_download_area: Unable to rename %s to %s\n",
old_name, new_name ));
close_cnum(conn, user->vuid);
unbecome_root();
pop_sec_ctx();
return False;
}
}
@ -499,7 +505,7 @@ BOOL move_driver_to_download_area(NT_PRINTER_DRIVER_INFO_LEVEL driver_abstract,
DEBUG(0,("move_driver_to_download_area: Unable to rename %s to %s\n",
old_name, new_name ));
close_cnum(conn, user->vuid);
unbecome_root();
pop_sec_ctx();
return False;
}
}
@ -516,7 +522,7 @@ BOOL move_driver_to_download_area(NT_PRINTER_DRIVER_INFO_LEVEL driver_abstract,
DEBUG(0,("move_driver_to_download_area: Unable to rename %s to %s\n",
old_name, new_name ));
close_cnum(conn, user->vuid);
unbecome_root();
pop_sec_ctx();
return False;
}
}
@ -524,7 +530,7 @@ BOOL move_driver_to_download_area(NT_PRINTER_DRIVER_INFO_LEVEL driver_abstract,
}
close_cnum(conn, user->vuid);
unbecome_root();
pop_sec_ctx();
return True;
}
@ -1946,7 +1952,7 @@ uint32 nt_printing_setsec(char *printername, SEC_DESC_BUF *secdesc_ctr)
static SEC_DESC_BUF *construct_default_printer_sdb(void)
{
SEC_ACE ace;
SEC_ACE ace[2];
SEC_ACCESS sa;
SEC_ACL *psa = NULL;
SEC_DESC_BUF *sdb = NULL;
@ -1958,7 +1964,7 @@ static SEC_DESC_BUF *construct_default_printer_sdb(void)
/* Create an ACE where Everyone is allowed to print */
init_sec_access(&sa, PRINTER_ACE_PRINT);
init_sec_ace(&ace, &global_sid_World, SEC_ACE_TYPE_ACCESS_ALLOWED,
init_sec_ace(&ace[0], &global_sid_World, SEC_ACE_TYPE_ACCESS_ALLOWED,
sa, SEC_ACE_FLAG_CONTAINER_INHERIT);
@ -1969,12 +1975,21 @@ static SEC_DESC_BUF *construct_default_printer_sdb(void)
sid_append_rid(&owner_sid, DOMAIN_USER_RID_ADMIN);
} else {
/* Backup plan - make printer owned by world. This should
/* Backup plan - make printer owned by admins or root. This should
emulate a lanman printer as security settings can't be
changed. */
if (!lookup_name( "Printer Administrators", &owner_sid, &name_type) &&
!lookup_name( "Administrators", &owner_sid, &name_type) &&
!lookup_name( "Administrator", &owner_sid, &name_type) &&
!lookup_name("root", &owner_sid, &name_type)) {
sid_copy(&owner_sid, &global_sid_World);
}
}
init_sec_access(&sa, PRINTER_ACE_FULL_CONTROL);
init_sec_ace(&ace[1], &owner_sid, SEC_ACE_TYPE_ACCESS_ALLOWED,
sa, SEC_ACE_FLAG_CONTAINER_INHERIT);
/* The ACL revision number in rpc_secdesc.h differs from the one
created by NT when setting ACE entries in printer
@ -1983,7 +1998,7 @@ static SEC_DESC_BUF *construct_default_printer_sdb(void)
#define NT4_ACL_REVISION 0x2
if ((psa = make_sec_acl(NT4_ACL_REVISION, 1, &ace)) != NULL) {
if ((psa = make_sec_acl(NT4_ACL_REVISION, 2, ace)) != NULL) {
psd = make_sec_desc(SEC_DESC_REVISION,
SEC_DESC_SELF_RELATIVE |
SEC_DESC_DACL_PRESENT,

17
source3/smbd/sec_ctx.c
View File

@ -221,15 +221,17 @@ BOOL push_sec_ctx(void)
/* Check we don't overflow our stack */
if (sec_ctx_stack_ndx == (MAX_SEC_CTX_DEPTH)) {
if (sec_ctx_stack_ndx == MAX_SEC_CTX_DEPTH) {
DEBUG(0, ("Security context stack overflow!\n"));
return False;
smb_panic("Security context stack overflow!\n");
}
/* Store previous user context */
sec_ctx_stack_ndx++;
DEBUG(3, ("push_sec_ctx() : sec_ctx_stack_ndx = %d\n", sec_ctx_stack_ndx ));
ctx_p = &sec_ctx_stack[sec_ctx_stack_ndx];
ctx_p->uid = geteuid();
@ -264,7 +266,7 @@ void set_sec_ctx(uid_t uid, gid_t gid, int ngroups, gid_t *groups, NT_USER_TOKEN
/* Set the security context */
DEBUG(3, ("setting sec ctx (%d, %d)\n", uid, gid));
DEBUG(3, ("setting sec ctx (%d, %d) - sec_ctx_stack_ndx = %d\n", uid, gid, sec_ctx_stack_ndx));
gain_root();
@ -275,6 +277,11 @@ void set_sec_ctx(uid_t uid, gid_t gid, int ngroups, gid_t *groups, NT_USER_TOKEN
ctx_p->ngroups = ngroups;
safe_free(ctx_p->groups);
#if 1 /* JRATEST */
if (token && (token == ctx_p->token))
smb_panic("DUPLICATE_TOKEN");
#endif
delete_nt_token(&ctx_p->token);
ctx_p->groups = memdup(groups, sizeof(gid_t) * ngroups);
@ -318,7 +325,7 @@ BOOL pop_sec_ctx(void)
if (sec_ctx_stack_ndx == 0) {
DEBUG(0, ("Security context stack underflow!\n"));
return False;
smb_panic("Security context stack underflow!\n");
}
ctx_p = &sec_ctx_stack[sec_ctx_stack_ndx];
@ -355,7 +362,7 @@ BOOL pop_sec_ctx(void)
current_user.groups = prev_ctx_p->groups;
current_user.nt_user_token = prev_ctx_p->token;
DEBUG(3, ("popped off to sec ctx (%d, %d)\n", geteuid(), getegid()));
DEBUG(3, ("pop_sec_ctx (%d, %d) - sec_ctx_stack_ndx = %d\n", geteuid(), getegid(), sec_ctx_stack_ndx));
return True;
}

22
source3/smbd/uid.c
View File

@ -89,6 +89,8 @@ BOOL become_user(connection_struct *conn, uint16 vuid)
gid_t gid;
uid_t uid;
char group_c;
BOOL must_free_token = False;
NT_USER_TOKEN *token = NULL;
if (!conn) {
DEBUG(2,("Connection not open\n"));
@ -125,6 +127,7 @@ BOOL become_user(connection_struct *conn, uint16 vuid)
gid = conn->gid;
current_user.groups = conn->groups;
current_user.ngroups = conn->ngroups;
token = conn->nt_user_token;
} else {
if (!vuser) {
DEBUG(2,("Invalid vuid used %d\n",vuid));
@ -134,6 +137,7 @@ BOOL become_user(connection_struct *conn, uint16 vuid)
gid = vuser->gid;
current_user.ngroups = vuser->n_groups;
current_user.groups = vuser->groups;
token = vuser->nt_user_token;
}
/*
@ -162,13 +166,27 @@ BOOL become_user(connection_struct *conn, uint16 vuid)
} else {
gid = conn->gid;
}
/*
* We've changed the group list in the token - we must
* re-create it.
*/
token = create_nt_token(uid, gid, current_user.ngroups, current_user.groups);
must_free_token = True;
}
set_sec_ctx(uid, gid, current_user.ngroups, current_user.groups, current_user.nt_user_token);
set_sec_ctx(uid, gid, current_user.ngroups, current_user.groups, token);
/*
* Free the new token (as set_sec_ctx copies it).
*/
if (must_free_token)
delete_nt_token(&token);
current_user.conn = conn;
current_user.vuid = vuid;
current_user.nt_user_token = conn->nt_user_token;
DEBUG(5,("become_user uid=(%d,%d) gid=(%d,%d)\n",
(int)getuid(),(int)geteuid(),(int)getgid(),(int)getegid()));