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-rw-r--r--source4/libcli/auth/ntlmssp_sign.c378
1 files changed, 378 insertions, 0 deletions
diff --git a/source4/libcli/auth/ntlmssp_sign.c b/source4/libcli/auth/ntlmssp_sign.c
new file mode 100644
index 0000000000..11d63ec5f3
--- /dev/null
+++ b/source4/libcli/auth/ntlmssp_sign.c
@@ -0,0 +1,378 @@
+/*
+ * Unix SMB/CIFS implementation.
+ * Version 3.0
+ * NTLMSSP Signing routines
+ * Copyright (C) Luke Kenneth Casson Leighton 1996-2001
+ * Copyright (C) Andrew Bartlett 2003
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include "includes.h"
+
+#define CLI_SIGN "session key to client-to-server signing key magic constant"
+#define CLI_SEAL "session key to client-to-server sealing key magic constant"
+#define SRV_SIGN "session key to server-to-client signing key magic constant"
+#define SRV_SEAL "session key to server-to-client sealing key magic constant"
+
+static void NTLMSSPcalc_ap( unsigned char *hash, unsigned char *data, int len)
+{
+ unsigned char index_i = hash[256];
+ unsigned char index_j = hash[257];
+ int ind;
+
+ for (ind = 0; ind < len; ind++)
+ {
+ unsigned char tc;
+ unsigned char t;
+
+ index_i++;
+ index_j += hash[index_i];
+
+ tc = hash[index_i];
+ hash[index_i] = hash[index_j];
+ hash[index_j] = tc;
+
+ t = hash[index_i] + hash[index_j];
+ data[ind] = data[ind] ^ hash[t];
+ }
+
+ hash[256] = index_i;
+ hash[257] = index_j;
+}
+
+static void calc_hash(unsigned char *hash, const char *k2, int k2l)
+{
+ unsigned char j = 0;
+ int ind;
+
+ for (ind = 0; ind < 256; ind++)
+ {
+ hash[ind] = (unsigned char)ind;
+ }
+
+ for (ind = 0; ind < 256; ind++)
+ {
+ unsigned char tc;
+
+ j += (hash[ind] + k2[ind%k2l]);
+
+ tc = hash[ind];
+ hash[ind] = hash[j];
+ hash[j] = tc;
+ }
+
+ hash[256] = 0;
+ hash[257] = 0;
+}
+
+static void calc_ntlmv2_hash(unsigned char hash[16], char digest[16],
+ DATA_BLOB session_key,
+ const char *constant)
+{
+ struct MD5Context ctx3;
+
+ /* NOTE: This code is currently complate fantasy - it's
+ got more in common with reality than the previous code
+ (the LM session key is not the right thing to use) but
+ it still needs work */
+
+ MD5Init(&ctx3);
+ MD5Update(&ctx3, session_key.data, session_key.length);
+ MD5Update(&ctx3, (const unsigned char *)constant, strlen(constant));
+ MD5Final((unsigned char *)digest, &ctx3);
+
+ calc_hash(hash, digest, 16);
+}
+
+enum ntlmssp_direction {
+ NTLMSSP_SEND,
+ NTLMSSP_RECEIVE
+};
+
+static NTSTATUS ntlmssp_make_packet_signature(NTLMSSP_STATE *ntlmssp_state,
+ const uchar *data, size_t length,
+ enum ntlmssp_direction direction,
+ DATA_BLOB *sig)
+{
+ if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
+ HMACMD5Context ctx;
+ char seq_num[4];
+ uchar digest[16];
+ SIVAL(seq_num, 0, ntlmssp_state->ntlmssp_seq_num);
+
+ hmac_md5_init_limK_to_64((const unsigned char *)(ntlmssp_state->send_sign_const), 16, &ctx);
+ hmac_md5_update((const unsigned char *)seq_num, 4, &ctx);
+ hmac_md5_update(data, length, &ctx);
+ hmac_md5_final(digest, &ctx);
+
+ if (!msrpc_gen(sig, "dBd", NTLMSSP_SIGN_VERSION, digest, 8 /* only copy first 8 bytes */
+ , ntlmssp_state->ntlmssp_seq_num)) {
+ return NT_STATUS_NO_MEMORY;
+ }
+ switch (direction) {
+ case NTLMSSP_SEND:
+ NTLMSSPcalc_ap(ntlmssp_state->send_sign_hash, sig->data+4, sig->length-4);
+ break;
+ case NTLMSSP_RECEIVE:
+ NTLMSSPcalc_ap(ntlmssp_state->recv_sign_hash, sig->data+4, sig->length-4);
+ break;
+ }
+ } else {
+ uint32 crc;
+ crc = crc32_calc_buffer((const char *)data, length);
+ if (!msrpc_gen(sig, "dddd", NTLMSSP_SIGN_VERSION, 0, crc, ntlmssp_state->ntlmssp_seq_num)) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ dump_data_pw("ntlmssp hash:\n", ntlmssp_state->ntlmssp_hash,
+ sizeof(ntlmssp_state->ntlmssp_hash));
+ NTLMSSPcalc_ap(ntlmssp_state->ntlmssp_hash, sig->data+4, sig->length-4);
+ }
+ return NT_STATUS_OK;
+}
+
+NTSTATUS ntlmssp_sign_packet(NTLMSSP_STATE *ntlmssp_state,
+ const uchar *data, size_t length,
+ DATA_BLOB *sig)
+{
+ NTSTATUS nt_status = ntlmssp_make_packet_signature(ntlmssp_state, data, length, NTLMSSP_SEND, sig);
+
+ /* increment counter on send */
+ ntlmssp_state->ntlmssp_seq_num++;
+ return nt_status;
+}
+
+/**
+ * Check the signature of an incoming packet
+ * @note caller *must* check that the signature is the size it expects
+ *
+ */
+
+NTSTATUS ntlmssp_check_packet(NTLMSSP_STATE *ntlmssp_state,
+ const uchar *data, size_t length,
+ const DATA_BLOB *sig)
+{
+ DATA_BLOB local_sig;
+ NTSTATUS nt_status;
+
+ if (sig->length < 8) {
+ DEBUG(0, ("NTLMSSP packet check failed due to short signature (%lu bytes)!\n",
+ (unsigned long)sig->length));
+ }
+
+ nt_status = ntlmssp_make_packet_signature(ntlmssp_state, data,
+ length, NTLMSSP_RECEIVE, &local_sig);
+
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ DEBUG(0, ("NTLMSSP packet check failed with %s\n", nt_errstr(nt_status)));
+ return nt_status;
+ }
+
+ if (memcmp(sig->data+sig->length - 8, local_sig.data+local_sig.length - 8, 8) != 0) {
+ DEBUG(5, ("BAD SIG: wanted signature of\n"));
+ dump_data(5, (const char *)local_sig.data, local_sig.length);
+
+ DEBUG(5, ("BAD SIG: got signature of\n"));
+ dump_data(5, (const char *)(sig->data), sig->length);
+
+ DEBUG(0, ("NTLMSSP packet check failed due to invalid signature!\n"));
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
+ /* increment counter on recieive */
+ ntlmssp_state->ntlmssp_seq_num++;
+
+ return NT_STATUS_OK;
+}
+
+
+/**
+ * Seal data with the NTLMSSP algorithm
+ *
+ */
+
+NTSTATUS ntlmssp_seal_packet(NTLMSSP_STATE *ntlmssp_state,
+ uchar *data, size_t length,
+ DATA_BLOB *sig)
+{
+ DEBUG(10,("ntlmssp_seal_data: seal\n"));
+ dump_data_pw("ntlmssp clear data\n", data, length);
+ if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
+ HMACMD5Context ctx;
+ char seq_num[4];
+ uchar digest[16];
+ SIVAL(seq_num, 0, ntlmssp_state->ntlmssp_seq_num);
+
+ hmac_md5_init_limK_to_64((const unsigned char *)(ntlmssp_state->send_sign_const), 16, &ctx);
+ hmac_md5_update((const unsigned char *)seq_num, 4, &ctx);
+ hmac_md5_update(data, length, &ctx);
+ hmac_md5_final(digest, &ctx);
+
+ if (!msrpc_gen(sig, "dBd", NTLMSSP_SIGN_VERSION, digest, 8 /* only copy first 8 bytes */
+ , ntlmssp_state->ntlmssp_seq_num)) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ dump_data_pw("ntlmssp client sealing hash:\n",
+ ntlmssp_state->send_seal_hash,
+ sizeof(ntlmssp_state->send_seal_hash));
+ NTLMSSPcalc_ap(ntlmssp_state->send_seal_hash, data, length);
+ dump_data_pw("ntlmssp client signing hash:\n",
+ ntlmssp_state->send_sign_hash,
+ sizeof(ntlmssp_state->send_sign_hash));
+ NTLMSSPcalc_ap(ntlmssp_state->send_sign_hash, sig->data+4, sig->length-4);
+ } else {
+ uint32 crc;
+ crc = crc32_calc_buffer((const char *)data, length);
+ if (!msrpc_gen(sig, "dddd", NTLMSSP_SIGN_VERSION, 0, crc, ntlmssp_state->ntlmssp_seq_num)) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ /* The order of these two operations matters - we must first seal the packet,
+ then seal the sequence number - this is becouse the ntlmssp_hash is not
+ constant, but is is rather updated with each iteration */
+
+ dump_data_pw("ntlmssp hash:\n", ntlmssp_state->ntlmssp_hash,
+ sizeof(ntlmssp_state->ntlmssp_hash));
+ NTLMSSPcalc_ap(ntlmssp_state->ntlmssp_hash, data, length);
+
+ dump_data_pw("ntlmssp hash:\n", ntlmssp_state->ntlmssp_hash,
+ sizeof(ntlmssp_state->ntlmssp_hash));
+ NTLMSSPcalc_ap(ntlmssp_state->ntlmssp_hash, sig->data+4, sig->length-4);
+ }
+ dump_data_pw("ntlmssp sealed data\n", data, length);
+
+ /* increment counter on send */
+ ntlmssp_state->ntlmssp_seq_num++;
+
+ return NT_STATUS_OK;
+}
+
+/**
+ * Unseal data with the NTLMSSP algorithm
+ *
+ */
+
+NTSTATUS ntlmssp_unseal_packet(NTLMSSP_STATE *ntlmssp_state,
+ uchar *data, size_t length,
+ DATA_BLOB *sig)
+{
+ DEBUG(10,("ntlmssp__unseal_data: seal\n"));
+ dump_data_pw("ntlmssp sealed data\n", data, length);
+ if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
+ NTLMSSPcalc_ap(ntlmssp_state->recv_seal_hash, data, length);
+ } else {
+ dump_data_pw("ntlmssp hash:\n", ntlmssp_state->ntlmssp_hash,
+ sizeof(ntlmssp_state->ntlmssp_hash));
+ NTLMSSPcalc_ap(ntlmssp_state->ntlmssp_hash, data, length);
+ }
+ dump_data_pw("ntlmssp clear data\n", data, length);
+
+ return ntlmssp_check_packet(ntlmssp_state, data, length, sig);
+}
+
+/**
+ Initialise the state for NTLMSSP signing.
+*/
+NTSTATUS ntlmssp_sign_init(NTLMSSP_STATE *ntlmssp_state)
+{
+ unsigned char p24[24];
+ ZERO_STRUCT(p24);
+
+ DEBUG(3, ("NTLMSSP Sign/Seal - Initialising with flags:\n"));
+ debug_ntlmssp_flags(ntlmssp_state->neg_flags);
+
+ if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2)
+ {
+ const char *send_sign_const;
+ const char *send_seal_const;
+ const char *recv_sign_const;
+ const char *recv_seal_const;
+
+ switch (ntlmssp_state->role) {
+ case NTLMSSP_CLIENT:
+ send_sign_const = CLI_SIGN;
+ send_seal_const = CLI_SEAL;
+ recv_sign_const = SRV_SIGN;
+ recv_seal_const = SRV_SEAL;
+ break;
+ case NTLMSSP_SERVER:
+ send_sign_const = SRV_SIGN;
+ send_seal_const = SRV_SEAL;
+ recv_sign_const = CLI_SIGN;
+ recv_seal_const = CLI_SEAL;
+ break;
+ }
+
+ calc_ntlmv2_hash(ntlmssp_state->send_sign_hash,
+ ntlmssp_state->send_sign_const,
+ ntlmssp_state->session_key, send_sign_const);
+ dump_data_pw("NTLMSSP send sign hash:\n",
+ ntlmssp_state->send_sign_hash,
+ sizeof(ntlmssp_state->send_sign_hash));
+
+ calc_ntlmv2_hash(ntlmssp_state->send_seal_hash,
+ ntlmssp_state->send_seal_const,
+ ntlmssp_state->session_key, send_seal_const);
+ dump_data_pw("NTLMSSP send sesl hash:\n",
+ ntlmssp_state->send_seal_hash,
+ sizeof(ntlmssp_state->send_seal_hash));
+
+ calc_ntlmv2_hash(ntlmssp_state->recv_sign_hash,
+ ntlmssp_state->recv_sign_const,
+ ntlmssp_state->session_key, send_sign_const);
+ dump_data_pw("NTLMSSP receive sign hash:\n",
+ ntlmssp_state->recv_sign_hash,
+ sizeof(ntlmssp_state->recv_sign_hash));
+
+ calc_ntlmv2_hash(ntlmssp_state->recv_seal_hash,
+ ntlmssp_state->recv_seal_const,
+ ntlmssp_state->session_key, send_seal_const);
+ dump_data_pw("NTLMSSP receive seal hash:\n",
+ ntlmssp_state->recv_sign_hash,
+ sizeof(ntlmssp_state->recv_sign_hash));
+
+ }
+ else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
+ if (!ntlmssp_state->session_key.data || ntlmssp_state->session_key.length < 8) {
+ /* can't sign or check signatures yet */
+ DEBUG(5, ("NTLMSSP Sign/Seal - cannot use LM KEY yet\n"));
+ return NT_STATUS_UNSUCCESSFUL;
+ }
+
+ DEBUG(5, ("NTLMSSP Sign/Seal - using LM KEY\n"));
+
+ calc_hash(ntlmssp_state->ntlmssp_hash, (const char *)(ntlmssp_state->session_key.data), 8);
+ dump_data_pw("NTLMSSP hash:\n", ntlmssp_state->ntlmssp_hash,
+ sizeof(ntlmssp_state->ntlmssp_hash));
+ } else {
+ if (!ntlmssp_state->session_key.data || ntlmssp_state->session_key.length < 16) {
+ /* can't sign or check signatures yet */
+ DEBUG(5, ("NTLMSSP Sign/Seal - cannot use NT KEY yet\n"));
+ return NT_STATUS_UNSUCCESSFUL;
+ }
+
+ DEBUG(5, ("NTLMSSP Sign/Seal - using NT KEY\n"));
+
+ calc_hash(ntlmssp_state->ntlmssp_hash, (const char *)(ntlmssp_state->session_key.data), 16);
+ dump_data_pw("NTLMSSP hash:\n", ntlmssp_state->ntlmssp_hash,
+ sizeof(ntlmssp_state->ntlmssp_hash));
+ }
+
+ ntlmssp_state->ntlmssp_seq_num = 0;
+
+ return NT_STATUS_OK;
+}