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author | speidy <speidy@gmail.com> | 2013-10-09 22:41:24 +0300 |
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committer | speidy <speidy@gmail.com> | 2013-10-09 22:41:24 +0300 |
commit | a8ab4cb5d1fa5d297b33e5802bf261707482f31e (patch) | |
tree | 9ec1803bafa00bdddf6ca8427997b024ac6bd0c0 /libxrdp/xrdp_iso.c | |
parent | a581dc28bb6bff8e62356cf28be9d9c6986382d9 (diff) | |
download | xrdp-proprietary-a8ab4cb5d1fa5d297b33e5802bf261707482f31e.tar.gz xrdp-proprietary-a8ab4cb5d1fa5d297b33e5802bf261707482f31e.zip |
libxrdp: work on RDP negotiation, add legacy non-nego support.
Diffstat (limited to 'libxrdp/xrdp_iso.c')
-rw-r--r-- | libxrdp/xrdp_iso.c | 96 |
1 files changed, 65 insertions, 31 deletions
diff --git a/libxrdp/xrdp_iso.c b/libxrdp/xrdp_iso.c index dad2698f..0691468e 100644 --- a/libxrdp/xrdp_iso.c +++ b/libxrdp/xrdp_iso.c @@ -97,12 +97,13 @@ xrdp_iso_recv_rdpnegreq(struct xrdp_iso *self, struct stream *s, int *requestedP /*****************************************************************************/ /* returns error */ static int APP_CC -xrdp_iso_recv_msg(struct xrdp_iso *self, struct stream *s, int *code) +xrdp_iso_recv_msg(struct xrdp_iso *self, struct stream *s, int *code, int *len) { - int ver; - int len; + int ver; // TPKT Version + int plen; // TPKT PacketLength - *code = 0; + *code = 0; // X.224 Packet Type + *len = 0; // X.224 Length Indicator if (xrdp_tcp_recv(self->tcp_layer, s, 4) != 0) { @@ -117,14 +118,14 @@ xrdp_iso_recv_msg(struct xrdp_iso *self, struct stream *s, int *code) } in_uint8s(s, 1); - in_uint16_be(s, len); + in_uint16_be(s, plen); - if (xrdp_tcp_recv(self->tcp_layer, s, len - 4) != 0) + if (xrdp_tcp_recv(self->tcp_layer, s, plen - 4) != 0) { return 1; } - in_uint8s(s, 1); + in_uint8(s, *len); in_uint8(s, *code); if (*code == ISO_PDU_DT) @@ -144,18 +145,19 @@ int APP_CC xrdp_iso_recv(struct xrdp_iso *self, struct stream *s) { int code; + int len; DEBUG((" in xrdp_iso_recv")); - if (xrdp_iso_recv_msg(self, s, &code) != 0) + if (xrdp_iso_recv_msg(self, s, &code, &len) != 0) { DEBUG((" out xrdp_iso_recv xrdp_iso_recv_msg return non zero")); return 1; } - if (code != ISO_PDU_DT) + if (code != ISO_PDU_DT || len != 2) { - DEBUG((" out xrdp_iso_recv code != ISO_PDU_DT")); + DEBUG((" out xrdp_iso_recv code != ISO_PDU_DT or length != 2")); return 1; } @@ -167,26 +169,49 @@ xrdp_iso_recv(struct xrdp_iso *self, struct stream *s) static int APP_CC xrdp_iso_send_rdpnegrsp(struct xrdp_iso *self, struct stream *s, int code, int selectedProtocol) { - if (xrdp_tcp_init(self->tcp_layer, s) != 0) + int send_rdpnegdata; + + if (xrdp_tcp_init(self->tcp_layer, s) != 0) { return 1; } + //check for RDPNEGDATA + send_rdpnegdata = 1; + if (selectedProtocol == -1) { + send_rdpnegdata = 0; + } + /* TPKT HEADER - 4 bytes */ out_uint8(s, 3); /* version */ out_uint8(s, 0); /* RESERVED */ - out_uint16_be(s, 19); /* length */ + if (send_rdpnegdata == 1) { + out_uint16_be(s, 19); /* length */ + } + else + { + out_uint16_be(s, 11); /* length */ + } /* ISO LAYER - X.224 - 7 bytes*/ - out_uint8(s, 14); /* length */ + if (send_rdpnegdata == 1) { + out_uint8(s, 14); /* length */ + } + else + { + out_uint8(s, 6); /* length */ + } out_uint8(s, code); /* SHOULD BE 0xD for CC */ out_uint16_be(s, 0); out_uint16_be(s, 0x1234); out_uint8(s, 0); - /* RDP_NEG_RSP - 8 bytes*/ - out_uint8(s, RDP_NEG_RSP); - out_uint8(s, EXTENDED_CLIENT_DATA_SUPPORTED); /* flags */ - out_uint16_le(s, 8); /* fixed length */ - out_uint32_le(s, selectedProtocol); /* selected protocol */ + if (send_rdpnegdata == 1) { + /* RDP_NEG_RSP - 8 bytes*/ + out_uint8(s, RDP_NEG_RSP); + out_uint8(s, EXTENDED_CLIENT_DATA_SUPPORTED); /* flags */ + out_uint16_le(s, 8); /* fixed length */ + out_uint32_le(s, selectedProtocol); /* selected protocol */ + } + s_mark_end(s); if (xrdp_tcp_send(self->tcp_layer, s) != 0) @@ -235,7 +260,7 @@ xrdp_iso_proccess_nego(struct xrdp_iso *self, struct stream *s, int requstedProt { //TODO: negotiation logic here. if (requstedProtocol != PROTOCOL_RDP) { - // Send RDP_NEG_Failure back to client + // Send RDP_NEG_FAILURE back to client if (xrdp_iso_send_rdpnegfailure(self, s, ISO_PDU_CC, SSL_NOT_ALLOWED_BY_SERVER) != 0) { free_stream(s); @@ -258,6 +283,7 @@ int APP_CC xrdp_iso_incoming(struct xrdp_iso *self) { int code; + int len; int requestedProtocol; int selectedProtocol; struct stream *s; @@ -265,8 +291,9 @@ xrdp_iso_incoming(struct xrdp_iso *self) init_stream(s, 8192); DEBUG((" in xrdp_iso_incoming")); - if (xrdp_iso_recv_msg(self, s, &code) != 0) + if (xrdp_iso_recv_msg(self, s, &code, &len) != 0) { + DEBUG((" in xrdp_iso_recv_msg error!!")); free_stream(s); return 1; } @@ -277,18 +304,25 @@ xrdp_iso_incoming(struct xrdp_iso *self) return 1; } - // Receive RDP_NEG_REQ data - if (xrdp_iso_recv_rdpnegreq(self, s, &requestedProtocol) != 0) - { - free_stream(s); - return 1; + if (len > 6) { + // Receive RDP_NEG_REQ data + if (xrdp_iso_recv_rdpnegreq(self, s, &requestedProtocol) != 0) + { + free_stream(s); + return 1; + } + // Process negotiation request, should return protocol type. + if (xrdp_iso_proccess_nego(self, s, requestedProtocol) != 0) + { + free_stream(s); + return 1; + } } - - // Process negotiation request, should return protocol type. - if (xrdp_iso_proccess_nego(self, s, requestedProtocol) != 0) - { - free_stream(s); - return 1; + else if (len == 6) { + xrdp_iso_send_rdpnegrsp(self, s, ISO_PDU_CC, -1); + } + else { + DEBUG((" error in xrdp_iso_incoming: unknown length detected")); } |