the N policy in sesman.ini, allowing xrdp sessions to be tagged with an
instance name to enable persistent association with a specific
xrdp instance, to allow experiences where users reconnect to specific
sessions based on e.g. the xrdp listening port used.
Functions are added to xrdpapi to allows the connection status
to be determimed. These functions are modelled on the Windows API
functions, but are not compatible with them. In particular, the error
handling is different.
A way for an application to receive events is also provided. At present,
only connect/disconnected events are implemented.
```
/home/user/CLionProjects/xrdp/common/list.c: In function ‘list_create_sized’:
/home/user/CLionProjects/xrdp/common/list.c:50:41: error: ‘calloc’ sizes specified with ‘sizeof’ in the earlier argument and not in the later argument [-Werror=calloc-transposed-args]
50 | self = (struct list *)calloc(sizeof(struct list), 1);
| ^~~~~~
/home/user/CLionProjects/xrdp/common/list.c:50:41: note: earlier argument should specify number of elements, later size of each element
```
Coverity scan picked up on the result on g_chmod_hex() not being
checked. This call has now been moved to the place where the file is
checked for writeability, as we only really need to make it when the
file is created.
This name better matches the name from [MS-RDPBCGR]. Also, the size
of the UTF-8 buffer allocated for the client name is not large
enough for some of the names which could potentially be passed across
in UTF-16 from the client.
This allows sesexec to send a reason for a connection close
request to xrdp.
xrdp is also updated to support server initiated disconnection sequences
from [MS-RDPBCGR] 1.3.1.4, along with reporting a reason to the client
for the disconnection.
This type can be used to store sets of integers. It is intended to
be used to keep track of the display numbers allocated to sessions and
SCP connections.
A test suite for the new type is also added.
The data in 'struct xrdp_client_info' which is shared with xorgxrdp
is separated out into a separate structure. This makes it simpler to
change 'struct xrdp_client_info' without affecting xorgxrdp.
1) In FIPS mode, Classic RDP security is not allowed at all.
2) In FIPS mode xrdp-keygen creates an empty file
3) Documentation wording improved around the security_level setting
4) Logging improved around the security negotiation
5) Warnings now generated if Classic RDP security is negotiated
These Coverity warnings all relate to the user of g_setenv() where the
return result isn't checked.
An additional void function g_setenv_log() is provided which logs
failures to set environment variables, and returns no status. This is
used in all the places where g_setenv_is currently called.
xrdp contains two functions which do similar things:-
- g_htoi() converts a hex string to an integer, ignoring unrecognised
characters
- xrdp_wm_htoi() converts a hex string to an integer, ignoring leading
whitespace, but terminating on unrecognised characters
An analysis of the uses of g_htoi() shows that the only place where
unrecognised characters might be encountered is parsing lines from
xrdp_keyboard.ini, where all values have an '0x' prefix (i.e. the 'x'
is unrecognised)
An analysis of xrdp_wm_htoi() shows that the functionality to ignore
leading whitespace is not used.
Both functions are replaced with a re-written g_htoi() which is const-
correct and provided with test cases. This function behaves in
the same way as the atoi() library function, in that it terminates on
an unexpected character.
The use of g_htoi() in parsing lines from xrdp_keyboard.ini is replaced
with a call to g_atoix() which handles the '0x' prefix correctly.
Too many places in xrdp use strncpy() to copy strings to fixed-length
buffers, when this is not the correct function to use.
This PR makes sure strlcpy() from the BSDs is available as a saner
alternative. This function is available by default on Linux and FreeBSD.
cppcheck 2.17.0 adds checks that a NULL pointer returned from malloc() and
calloc() is not used.
We do this quite a lot.
I've addressed this by adding functions g_malloc_nofail() and
g_calloc_nofail() which either allocate memory or abort.
functions are now called in places where we are not making these
checks.
Many of these checks are in test programs or example programs.
I've modified the list16 module to handle out-of-memory conditions.
Coverity has generated a number of 'Data race condition' and 'Double
lock' false positives. A lot of these seem to be caused by the NULL
guard in tc_mutex_unlock() not being paired with a NULL guard in
tc_mutex_lock(). This PR adds a NULL guard to tc_mutex_lock().
It should be noted, that on Linux at least, passing NULL to
tc_mutex_lock() causes a segfault. We clearly aren't doing this at the
moment, or we'd know about it. A log message is generated if a NULL
call is made, rather than failing silently.
This allows the `xrdp` part of the path `/etc/xrdp` where config files
are placed to be customizable. This change is useful when trying the
stable version and the devel version alternately.
The function as specified used gettimeofday() which is susceptible
to manual time changes, and is obsoleted in POSIX.1-2008. The
replacement uses clock_gettime(CLOCK_MONOTONIC, ) which is not
susceptible to manual time changes (at least on Linux) and cannot run
backwards.
Also, on systems with 32-bit integers, the value returned by this
function wraps around every 49.7 days. To cope with a wraparound in
a way compliant with the C standard, this value needs to return an
unsigned integer type rather than a signed integer type.
matt335672