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Fix pty permssion handling in new permission handling code 

* sec_acl.cc (set_posix_access): Always make sure Admins have
        WRITE_DAC and WRITE_OWNER permissions.
        * security.h (create_object_sd_from_attribute): Drop handle parameter
        from prototype.
        * security.cc (create_object_sd_from_attribute): Drop handle parameter.
        Just create the standard POSIXy security descriptor.
        (set_object_attribute): Accommodate dropped paramter in call to
        create_object_sd_from_attribute.
        * fhandler_tty.cc: Ditto, throughout.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2015-04-12 20:26:27 +02:00
parent 7d061316c0
commit cf6ff1c321
5 changed files with 42 additions and 21 deletions
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12
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,15 @@
2015-04-12 Corinna Vinschen <corinna@vinschen.de>
* sec_acl.cc (set_posix_access): Always make sure Admins have
WRITE_DAC and WRITE_OWNER permissions.
* security.h (create_object_sd_from_attribute): Drop handle parameter
from prototype.
* security.cc (create_object_sd_from_attribute): Drop handle parameter.
Just create the standard POSIXy security descriptor.
(set_object_attribute): Accommodate dropped paramter in call to
create_object_sd_from_attribute.
* fhandler_tty.cc: Ditto, throughout.
2015-04-12 Corinna Vinschen <corinna@vinschen.de>
* shm.cc (shmget): Fetch segment size from server rather than using

15
winsup/cygwin/fhandler_tty.cc
View File

@ -387,9 +387,8 @@ fhandler_pty_slave::open (int flags, mode_t)
sd.malloc (sizeof (SECURITY_DESCRIPTOR));
RtlCreateSecurityDescriptor (sd, SECURITY_DESCRIPTOR_REVISION);
SECURITY_ATTRIBUTES sa = { sizeof (SECURITY_ATTRIBUTES), NULL, TRUE };
if (!create_object_sd_from_attribute (NULL, myself->uid, myself->gid,
S_IFCHR | S_IRUSR | S_IWUSR | S_IWGRP,
sd))
if (!create_object_sd_from_attribute (myself->uid, myself->gid,
S_IRUSR | S_IWUSR | S_IWGRP, sd))
sa.lpSecurityDescriptor = (PSECURITY_DESCRIPTOR) sd;
acquire_output_mutex (INFINITE);
inuse = get_ttyp ()->create_inuse (&sa);
@ -1093,7 +1092,7 @@ fhandler_pty_slave::fchmod (mode_t mode)
sd.malloc (sizeof (SECURITY_DESCRIPTOR));
RtlCreateSecurityDescriptor (sd, SECURITY_DESCRIPTOR_REVISION);
if (!get_object_attribute (input_available_event, &uid, &gid, NULL)
&& !create_object_sd_from_attribute (NULL, uid, gid, S_IFCHR | mode, sd))
&& !create_object_sd_from_attribute (uid, gid, mode, sd))
ret = fch_set_sd (sd, false);
errout:
if (to_close)
@ -1126,8 +1125,7 @@ fhandler_pty_slave::fchown (uid_t uid, gid_t gid)
if ((uid == ILLEGAL_UID || uid == o_uid)
&& (gid == ILLEGAL_GID || gid == o_gid))
ret = 0;
else if (!create_object_sd_from_attribute (input_available_event,
uid, gid, S_IFCHR | mode, sd))
else if (!create_object_sd_from_attribute (uid, gid, mode, sd))
ret = fch_set_sd (sd, true);
}
errout:
@ -1598,9 +1596,8 @@ fhandler_pty_master::setup ()
/* Create security attribute. Default permissions are 0620. */
sd.malloc (sizeof (SECURITY_DESCRIPTOR));
RtlCreateSecurityDescriptor (sd, SECURITY_DESCRIPTOR_REVISION);
if (!create_object_sd_from_attribute (NULL, myself->uid, myself->gid,
S_IFCHR | S_IRUSR | S_IWUSR | S_IWGRP,
sd))
if (!create_object_sd_from_attribute (myself->uid, myself->gid,
S_IRUSR | S_IWUSR | S_IWGRP, sd))
sa.lpSecurityDescriptor = (PSECURITY_DESCRIPTOR) sd;
/* Carefully check that the input_available_event didn't already exist.

16
winsup/cygwin/sec_acl.cc
View File

@ -141,6 +141,7 @@ set_posix_access (mode_t attr, uid_t uid, gid_t gid,
mode_t class_obj = 0, other_obj, group_obj, deny;
DWORD access;
int idx, start_idx, class_idx, tmp_idx;
bool dev_saw_admins = false;
/* Initialize local security descriptor. */
RtlCreateSecurityDescriptor (&sd, SECURITY_DESCRIPTOR_REVISION);
@ -335,6 +336,14 @@ set_posix_access (mode_t attr, uid_t uid, gid_t gid,
if (aclbufp[idx].a_perm == S_IRWXO)
access |= FILE_DELETE_CHILD;
}
/* For ptys check if the admins group is in the ACL. If so,
make sure the group has WRITE_DAC and WRITE_OWNER perms. */
if (S_ISCHR (attr) && !dev_saw_admins
&& aclsid[idx] == well_known_admins_sid)
{
access |= STD_RIGHTS_OWNER;
dev_saw_admins = true;
}
if (aclbufp[idx].a_perm & S_IROTH)
access |= FILE_ALLOW_READ;
if (aclbufp[idx].a_perm & S_IWOTH)
@ -352,6 +361,13 @@ set_posix_access (mode_t attr, uid_t uid, gid_t gid,
return NULL;
}
}
/* For ptys if the admins group isn't in the ACL, add an ACE to make
sure the group has WRITE_DAC and WRITE_OWNER perms. */
if (S_ISCHR (attr) && !dev_saw_admins
&& !add_access_allowed_ace (acl, STD_RIGHTS_OWNER,
well_known_admins_sid, acl_len,
NO_INHERITANCE))
return NULL;
/* Create allow ACE for other. It's preceeded by class_obj if it exists.
If so, skip it. */
if (aclbufp[idx].a_type & CLASS_OBJ)

16
winsup/cygwin/security.cc
View File

@ -409,14 +409,11 @@ get_object_attribute (HANDLE handle, uid_t *uidret, gid_t *gidret,
}
int
create_object_sd_from_attribute (HANDLE handle, uid_t uid, gid_t gid,
mode_t attribute, security_descriptor &sd)
create_object_sd_from_attribute (uid_t uid, gid_t gid, mode_t attribute,
security_descriptor &sd)
{
path_conv pc;
if ((handle && get_object_sd (handle, sd))
|| !set_posix_access (attribute, uid, gid, NULL, 0, sd, false))
return -1;
return 0;
return set_posix_access (S_IFCHR | attribute, uid, gid, NULL, 0, sd, false)
? 0 : -1;
}
int
@ -434,12 +431,11 @@ set_object_sd (HANDLE handle, security_descriptor &sd, bool chown)
}
int
set_object_attribute (HANDLE handle, uid_t uid, gid_t gid,
mode_t attribute)
set_object_attribute (HANDLE handle, uid_t uid, gid_t gid, mode_t attribute)
{
security_descriptor sd;
if (create_object_sd_from_attribute (handle, uid, gid, attribute, sd)
if (create_object_sd_from_attribute (uid, gid, attribute, sd)
|| set_object_sd (handle, sd, uid != ILLEGAL_UID || gid != ILLEGAL_GID))
return -1;
return 0;

4
winsup/cygwin/security.h
View File

@ -440,8 +440,8 @@ int __reg3 set_created_file_access (HANDLE, path_conv &, mode_t);
int __reg2 get_object_sd (HANDLE, security_descriptor &);
int __reg3 get_object_attribute (HANDLE, uid_t *, gid_t *, mode_t *);
int __reg3 set_object_attribute (HANDLE, uid_t, gid_t, mode_t);
int __reg3 create_object_sd_from_attribute (HANDLE, uid_t, gid_t,
mode_t, security_descriptor &);
int __reg3 create_object_sd_from_attribute (uid_t, gid_t, mode_t,
security_descriptor &);
int __reg3 set_object_sd (HANDLE, security_descriptor &, bool);
int __reg3 get_reg_attribute (HKEY hkey, mode_t *, uid_t *, gid_t *);