[MS-RDPBCGR] Section 5.3 describes the encryption level and method values for
standard RDP security.
Looking at the current usage of these values in the FreeRDP code gives me
reason to believe that there is a certain lack of understanding of how these
values should be handled.
The encryption level is only configured on the server side in the "Encryption
Level" setting found in the Remote Desktop Session Host Configuration RDP-Tcp
properties dialog and this value is never transferred from the client to the
server over the wire.
The possible options are "None", "Low", "Client Compatible", "High" and
"FIPS Compliant". The client receices this value in the Server Security Data
block (TS_UD_SC_SEC1), probably only for informational purposes and maybe to
give the client the possibility to verify if the server's decision for the
encryption method confirms to the server's encryption level.
The possible encryption methods are "NONE", "40BIT", "56BIT", "128BIT" and
"FIPS" and the RDP client advertises the ones it supports to the server in the
Client Security Data block (TS_UD_CS_SEC).
The server's configured encryption level value restricts the possible final
encryption method.
Something that I was not able to find in the documentation is the priority
level of the individual encryption methods based on which the server makes its
final method decision if there are several options.
My analysis with Windows Servers reveiled that the order is 128, 56, 40, FIPS.
The server only chooses FIPS if the level is "FIPS Comliant" or if it is the
only method advertised by the client.
Bottom line:
* FreeRDP's client side does not need to set settings->EncryptionLevel
(which was done quite frequently).
* FreeRDP's server side does not have to set the supported encryption methods
list in settings->EncryptionMethods
Changes in this commit:
Removed unnecessary/confusing changes of EncryptionLevel/Methods settings
Refactor settings->DisableEncryption
* This value actually means "Advanced RDP Encryption (NLA/TLS) is NOT used"
* The old name caused lots of confusion among developers
* Renamed it to "UseRdpSecurityLayer" (the compare logic stays untouched)
Any client's setting of settings->EncryptionMethods were annihilated
* All clients "want" to set all supported methods
* Some clients forgot 56bit because 56bit was not supported at the time the
code was written
* settings->EncryptionMethods was overwritten anyways in nego_connect()
* Removed all client side settings of settings->EncryptionMethods
The default is "None" (0)
* Changed nego_connect() to advertise all supported methods if
settings->EncryptionMethods is 0 (None)
* Added a commandline option /encryption-methods:comma separated list of the
values "40", "56", "128", "FIPS". E.g. /encryption-methods:56,128
* Print warning if server chooses non-advertised method
Verify received level and method in client's gcc_read_server_security_data
* Only accept valid/known encryption methods
* Verify encryption level/method combinations according to MS-RDPBCGR 5.3.2
Server implementations can now set settings->EncryptionLevel
* The default for settings->EncryptionLevel is 0 (None)
* nego_send_negotiation_response() changes it to ClientCompatible in that case
* default to ClientCompatible if the server implementation set an invalid level
Fix server's gcc_write_server_security_data
* Verify server encryption level value set by server implementations
* Choose rdp encryption method based on level and supported client methods
* Moved FIPS to the lowest priority (only used if other methods are possible)
Updated sample server
* Support RDP Security (RdpKeyFile was not set)
* Added commented sample code for setting the security level
"libfreerdp" consisted of multiple (small) single libraries. If the cmake
option MONOLITHIC was used only one library was build combining all of
the libfreerdp-* libraries.
The only exceptions to this are libfreerdp-server and libfreerdp-client these
are build as separate libraries.
This commit obsoltes non-monolithic builds and makes monolithic builds
the default. The cmake option MONOLITHIC is also removed.
1.0 had the ability to specifiy window geometry by a percentage.
The support is still there, just needed command line support.
Example in 1.1 syntax: /size:85%
This adds 2 arguments:
/tls-ciphers List of permitted openssl ciphers - see ciphers(1)
/tls-ciphers-netmon Use tls ciphers that netmon can parse
With KB2919355, client/server negotiate the use of
TLS cipher TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
which works fine except that netmon can't parse it.
By adding commandline /tls-ciphers-netmon, we restrict
the available ciphers to a list that netmon can
deal with. Also adds /tls-ciphers, which
accepts a string arg, for further customization.
winpr is now always build as single library.
The build option MONOLITHIC_BUILD doesn't influence this behavior anymore.
The only exception is winpr-makecert-tool which is still build as extra
library.
This obsoletes complex_libraries for winpr.
# By Marc-André Moreau (20) and others
# Via Mike McDonald (6) and others
* 'master' of git://github.com/awakecoding/FreeRDP: (26 commits)
libfreerdp-codec: fix C++ headers
libfreerdp-codec: fix ClearCodec short vbar cache hit
libfreerdp-codec: improve ClearCodec error checking
libfreerdp-codec: fix ClearCodec RLEX decoding
libfreerdp-codec: ClearCodec fix error codes and wrapping around of cursors
libfreerdp-codec: fix some ClearCodec flag checking
Fixed issue with last merge.
Added #ifdef WITH_OPENH264 ... #endif to appropriate places in the code.
libfreerdp-codec: handle long vbar length mismatch
channels/rdpgfx: add egfx command line options and settings
libfreerdp-codec: reduce number of variables
libfreerdp-codec: improve ClearCodec robustness
libfreerdp-codec: simplify ClearCodec code
Initial implementation of H.264 decoder for MS-RDPEGFX
libfreerdp-codec: improve ClearCodec subcodec xStart, yStart handling
libfreerdp-codec: improve ClearCodec subcodec support
libfreerdp-codec: improve ClearCodec error checking
libfreerdp-codec: more ClearCodec vBar caching
channels/rdpgfx: harden parsing code
libfreerdp-codec: add ClearCodec glyph cache
...
This patch changes the prototype for decode_base64 so that the encode / decode
method are consistant (encode(BYTE *) => char* and decode(char*) => BYTE*).
It also does some improvements with unrolling loops so that end conditions are
tested only at the end.
The patch also adds some unitary tests.
Before the patch base64_decode() made valgrind complain about uninitialized
bits, after valgrind is happy and very quiet.
- fixed invalid stream position if extEncryptionMethods is not used
- enabled 56bit rdp security method
- fixed entropy reduction of the keys for 40 bit and 56 bit
- added rdp security incl. FIPS for fastpath output
- added FIPS encryption to fast path input
- fixed FIPS key generation in server mode
- fixed stream length correction in FIPS mode
- added rdp encryption for licensing packets (apparently some clients,
specifically cetsc, require the license packets received from the
server to be encrypted under certain RDP encryption levels)
- replace errnous virtual extended mouse event in focus in event
# By Marc-André Moreau (27) and others
# Via Marc-André Moreau
* 'master' of git://github.com/awakecoding/FreeRDP: (48 commits)
afreerdp: fix build on Android
libwinpr-wtsapi: include wtsapi32.h on Windows
wfreerdp: fix target exporting
wfreerdp: fix building against OpenSSL with MONOLITHIC_BUILD and shared libraries
wfreerdp: fix test build issues
libwinpr-crypto: implement CryptProtectMemory/CryptUnprotectMemory
libwinpr-memory: add missing definitions
libwinpr-memory: start stubbing
Increased size of stream on GCC conference create request from 512 to 1024. For large numbers of static virtual channels, the stream was being overflowed and was causing crashes.
Fixes to process new command line options (autodetect, heartbeat, multitransport), join the MCS message channel and process auto-detect PDUs during the connection sequence.
wfreerdp: fix build against static openssl library
winpr-hash: fix building against openssl in static mode
libfreerdp-gdi: fix invalidation of region with line drawing
mfreerdp: fix hungarian keyboard '0' and 'i' key inversion
Fixes build issue on Windows
libwinpr-synch: add active/inactive linked list for timer queue
libwinpr-synch: improve timer queue implementation
libwinpr-synch: make use of head's expiration time in timer queue
libwinpr-synch: make use of timespec for timer queue
libwinpr-synch: improve timer queue implementation
...
Conflicts:
client/common/CMakeLists.txt
