diff options
Diffstat (limited to 'source3/libsmb/smb_signing.c')
| -rw-r--r-- | source3/libsmb/smb_signing.c | 730 |
1 files changed, 622 insertions, 108 deletions
diff --git a/source3/libsmb/smb_signing.c b/source3/libsmb/smb_signing.c index d4f77bf07c..4167452953 100644 --- a/source3/libsmb/smb_signing.c +++ b/source3/libsmb/smb_signing.c @@ -1,7 +1,7 @@ /* Unix SMB/CIFS implementation. SMB Signing Code - Copyright (C) Jeremy Allison 2002. + Copyright (C) Jeremy Allison 2003. Copyright (C) Andrew Bartlett <abartlet@samba.org> 2002-2003 This program is free software; you can redistribute it and/or modify @@ -28,9 +28,17 @@ struct outstanding_packet_lookup { struct outstanding_packet_lookup *prev, *next; }; +/* Store the data for an ongoing trans/trans2/nttrans operation. */ +struct trans_info_context { + uint16 mid; + uint32 send_seq_num; + uint32 reply_seq_num; +}; + struct smb_basic_signing_context { DATA_BLOB mac_key; uint32 send_seq_num; + struct trans_info_context *trans_info; struct outstanding_packet_lookup *outstanding_packet_list; }; @@ -46,6 +54,8 @@ static void store_sequence_for_reply(struct outstanding_packet_lookup **list, DLIST_ADD_END(*list, t, tmp); t->mid = mid; t->reply_seq_num = reply_seq_num; + DEBUG(10,("store_sequence_for_reply: stored seq = %u mid = %u\n", + (unsigned int)reply_seq_num, (unsigned int)mid )); } static BOOL get_sequence_for_reply(struct outstanding_packet_lookup **list, @@ -56,12 +66,13 @@ static BOOL get_sequence_for_reply(struct outstanding_packet_lookup **list, for (t = *list; t; t = t->next) { if (t->mid == mid) { *reply_seq_num = t->reply_seq_num; + DEBUG(10,("get_sequence_for_reply: found seq = %u mid = %u\n", + (unsigned int)t->reply_seq_num, (unsigned int)t->mid )); DLIST_REMOVE(*list, t); + SAFE_FREE(t); return True; } } - DEBUG(0, ("Unexpected incoming packet, it's MID (%u) does not match" - " a MID in our outstanding list!\n", mid)); return False; } @@ -81,7 +92,7 @@ static BOOL cli_set_smb_signing_common(struct cli_state *cli) } if (cli->sign_info.free_signing_context) - cli->sign_info.free_signing_context(cli); + cli->sign_info.free_signing_context(&cli->sign_info); /* These calls are INCOMPATIBLE with SMB signing */ cli->readbraw_supported = False; @@ -94,42 +105,107 @@ static BOOL cli_set_smb_signing_common(struct cli_state *cli) SMB signing - Common code for 'real' implementations ************************************************************/ -static BOOL cli_set_smb_signing_real_common(struct cli_state *cli) +static BOOL set_smb_signing_real_common(struct smb_sign_info *si) { - if (cli->sign_info.mandatory_signing) { + if (si->mandatory_signing) { DEBUG(5, ("Mandatory SMB signing enabled!\n")); - cli->sign_info.doing_signing = True; } + si->doing_signing = True; DEBUG(5, ("SMB signing enabled!\n")); return True; } -static void cli_mark_packet_signed(struct cli_state *cli) +static void mark_packet_signed(char *outbuf) { uint16 flags2; - flags2 = SVAL(cli->outbuf,smb_flg2); + flags2 = SVAL(outbuf,smb_flg2); flags2 |= FLAGS2_SMB_SECURITY_SIGNATURES; - SSVAL(cli->outbuf,smb_flg2, flags2); + SSVAL(outbuf,smb_flg2, flags2); +} + +/*********************************************************** + SMB signing - NULL implementation - calculate a MAC to send. +************************************************************/ + +static void null_sign_outgoing_message(char *outbuf, struct smb_sign_info *si) +{ + /* we can't zero out the sig, as we might be trying to send a + session request - which is NBT-level, not SMB level and doesn't + have the field */ + return; +} + +/*********************************************************** + SMB signing - NULL implementation - check a MAC sent by server. +************************************************************/ + +static BOOL null_check_incoming_message(char *inbuf, struct smb_sign_info *si) +{ + return True; } -static BOOL cli_signing_good(struct cli_state *cli, BOOL good) +/*********************************************************** + SMB signing - NULL implementation - free signing context +************************************************************/ + +static void null_free_signing_context(struct smb_sign_info *si) { - DEBUG(10, ("got SMB signature of\n")); - dump_data(10,&cli->inbuf[smb_ss_field] , 8); + return; +} - if (good && !cli->sign_info.doing_signing) { - cli->sign_info.doing_signing = True; +/** + SMB signing - NULL implementation - setup the MAC key. + + @note Used as an initialisation only - it will not correctly + shut down a real signing mechanism +*/ + +static BOOL null_set_signing(struct smb_sign_info *si) +{ + si->signing_context = NULL; + + si->sign_outgoing_message = null_sign_outgoing_message; + si->check_incoming_message = null_check_incoming_message; + si->free_signing_context = null_free_signing_context; + + return True; +} + +/** + * Free the signing context + */ + +static void free_signing_context(struct smb_sign_info *si) +{ + if (si->free_signing_context) { + si->free_signing_context(si); + si->signing_context = NULL; + } + + null_set_signing(si); +} + + +static BOOL signing_good(char *inbuf, struct smb_sign_info *si, BOOL good) +{ + if (good && !si->doing_signing) { + si->doing_signing = True; } if (!good) { - if (cli->sign_info.doing_signing) { - DEBUG(1, ("SMB signature check failed!\n")); + if (si->doing_signing) { + struct smb_basic_signing_context *data = si->signing_context; + + /* W2K sends a bad first signature but the sign engine is on.... JRA. */ + if (data->send_seq_num > 1) + DEBUG(1, ("signing_good: SMB signature check failed!\n")); + return False; } else { - DEBUG(3, ("Server did not sign reply correctly\n")); - cli_free_signing_context(cli); + DEBUG(3, ("signing_good: Peer did not sign reply correctly\n")); + free_signing_context(si); return False; } } @@ -155,13 +231,15 @@ static void simple_packet_signature(struct smb_basic_signing_context *data, * We do this here, to avoid modifying the packet. */ + DEBUG(10,("simple_packet_signature: sequence number %u\n", seq_number )); + SIVAL(sequence_buf, 0, seq_number); SIVAL(sequence_buf, 4, 0); /* Calculate the 16 byte MAC - but don't alter the data in the incoming packet. - This makes for a bit for fussing about, but it's not too bad. + This makes for a bit of fussing about, but it's not too bad. */ MD5Init(&md5_ctx); @@ -179,82 +257,130 @@ static void simple_packet_signature(struct smb_basic_signing_context *data, MD5Update(&md5_ctx, buf + offset_end_of_sig, smb_len(buf) - (offset_end_of_sig - 4)); - /* caclulate the MD5 sig */ + /* calculate the MD5 sig */ MD5Final(calc_md5_mac, &md5_ctx); } /*********************************************************** - SMB signing - Simple implementation - send the MAC. + SMB signing - Client implementation - send the MAC. ************************************************************/ -static void cli_simple_sign_outgoing_message(struct cli_state *cli) +static void client_sign_outgoing_message(char *outbuf, struct smb_sign_info *si) { unsigned char calc_md5_mac[16]; - struct smb_basic_signing_context *data = cli->sign_info.signing_context; + struct smb_basic_signing_context *data = si->signing_context; + uint32 send_seq_num; + + if (!si->doing_signing) + return; + + /* JRA Paranioa test - we should be able to get rid of this... */ + if (smb_len(outbuf) < (smb_ss_field + 8 - 4)) { + DEBUG(1, ("client_sign_outgoing_message: Logic error. Can't check signature on short packet! smb_len = %u\n", + smb_len(outbuf) )); + abort(); + } /* mark the packet as signed - BEFORE we sign it...*/ - cli_mark_packet_signed(cli); + mark_packet_signed(outbuf); - simple_packet_signature(data, cli->outbuf, data->send_seq_num, - calc_md5_mac); + if (data->trans_info) + send_seq_num = data->trans_info->send_seq_num; + else + send_seq_num = data->send_seq_num; - DEBUG(10, ("sent SMB signature of\n")); + simple_packet_signature(data, outbuf, send_seq_num, calc_md5_mac); + + DEBUG(10, ("client_sign_outgoing_message: sent SMB signature of\n")); dump_data(10, calc_md5_mac, 8); - memcpy(&cli->outbuf[smb_ss_field], calc_md5_mac, 8); + memcpy(&outbuf[smb_ss_field], calc_md5_mac, 8); /* cli->outbuf[smb_ss_field+2]=0; Uncomment this to test if the remote server actually verifies signatures...*/ + if (data->trans_info) + return; + data->send_seq_num++; store_sequence_for_reply(&data->outstanding_packet_list, - cli->mid, + SVAL(outbuf,smb_mid), data->send_seq_num); data->send_seq_num++; } /*********************************************************** - SMB signing - Simple implementation - check a MAC sent by server. + SMB signing - Client implementation - check a MAC sent by server. ************************************************************/ -static BOOL cli_simple_check_incoming_message(struct cli_state *cli) +static BOOL client_check_incoming_message(char *inbuf, struct smb_sign_info *si) { BOOL good; uint32 reply_seq_number; unsigned char calc_md5_mac[16]; unsigned char *server_sent_mac; - struct smb_basic_signing_context *data = cli->sign_info.signing_context; + struct smb_basic_signing_context *data = si->signing_context; + + if (!si->doing_signing) + return True; - if (!get_sequence_for_reply(&data->outstanding_packet_list, - SVAL(cli->inbuf, smb_mid), + if (smb_len(inbuf) < (smb_ss_field + 8 - 4)) { + DEBUG(1, ("client_check_incoming_message: Can't check signature on short packet! smb_len = %u\n", smb_len(inbuf))); + return False; + } + + if (data->trans_info) { + reply_seq_number = data->trans_info->reply_seq_num; + } else if (!get_sequence_for_reply(&data->outstanding_packet_list, + SVAL(inbuf, smb_mid), &reply_seq_number)) { + DEBUG(1, ("client_check_incoming_message: failed to get sequence number %u for reply.\n", + (unsigned int) SVAL(inbuf, smb_mid) )); return False; } - simple_packet_signature(data, cli->inbuf, reply_seq_number, calc_md5_mac); + simple_packet_signature(data, inbuf, reply_seq_number, calc_md5_mac); - server_sent_mac = &cli->inbuf[smb_ss_field]; + server_sent_mac = &inbuf[smb_ss_field]; good = (memcmp(server_sent_mac, calc_md5_mac, 8) == 0); if (!good) { - DEBUG(5, ("BAD SIG: wanted SMB signature of\n")); + DEBUG(5, ("client_check_incoming_message: BAD SIG: wanted SMB signature of\n")); dump_data(5, calc_md5_mac, 8); - DEBUG(5, ("BAD SIG: got SMB signature of\n")); + DEBUG(5, ("client_check_incoming_message: BAD SIG: got SMB signature of\n")); dump_data(5, server_sent_mac, 8); +#if 1 /* JRATEST */ + { + int i; + reply_seq_number -= 5; + for (i = 0; i < 10; i++, reply_seq_number++) { + simple_packet_signature(data, inbuf, reply_seq_number, calc_md5_mac); + if (memcmp(server_sent_mac, calc_md5_mac, 8) == 0) { + DEBUG(0,("client_check_incoming_message: out of seq. seq num %u matches.\n", + reply_seq_number )); + break; + } + } + } +#endif /* JRATEST */ + + } else { + DEBUG(10, ("client_check_incoming_message:: seq %u: got good SMB signature of\n", (unsigned int)reply_seq_number)); + dump_data(10, server_sent_mac, 8); } - return cli_signing_good(cli, good); + return signing_good(inbuf, si, good); } /*********************************************************** SMB signing - Simple implementation - free signing context ************************************************************/ -static void cli_simple_free_signing_context(struct cli_state *cli) +static void simple_free_signing_context(struct smb_sign_info *si) { - struct smb_basic_signing_context *data = cli->sign_info.signing_context; + struct smb_basic_signing_context *data = si->signing_context; struct outstanding_packet_lookup *list = data->outstanding_packet_list; while (list) { @@ -264,7 +390,11 @@ static void cli_simple_free_signing_context(struct cli_state *cli) } data_blob_free(&data->mac_key); - SAFE_FREE(cli->sign_info.signing_context); + + if (data->trans_info) + SAFE_FREE(data->trans_info); + + SAFE_FREE(si->signing_context); return; } @@ -284,18 +414,29 @@ BOOL cli_simple_set_signing(struct cli_state *cli, const uchar user_session_key[ return False; } - if (!cli_set_smb_signing_real_common(cli)) { + if (!set_smb_signing_real_common(&cli->sign_info)) { return False; } data = smb_xmalloc(sizeof(*data)); + memset(data, '\0', sizeof(*data)); cli->sign_info.signing_context = data; data->mac_key = data_blob(NULL, response.length + 16); memcpy(&data->mac_key.data[0], user_session_key, 16); - memcpy(&data->mac_key.data[16],response.data, response.length); + + DEBUG(10, ("cli_simple_set_signing: user_session_key\n")); + dump_data(10, user_session_key, 16); + + if (response.length) { + memcpy(&data->mac_key.data[16],response.data, response.length); + DEBUG(10, ("cli_simple_set_signing: response_data\n")); + dump_data(10, response.data, response.length); + } else { + DEBUG(10, ("cli_simple_set_signing: NULL response_data\n")); + } /* Initialise the sequence number */ data->send_seq_num = 0; @@ -303,73 +444,68 @@ BOOL cli_simple_set_signing(struct cli_state *cli, const uchar user_session_key[ /* Initialise the list of outstanding packets */ data->outstanding_packet_list = NULL; - cli->sign_info.sign_outgoing_message = cli_simple_sign_outgoing_message; - cli->sign_info.check_incoming_message = cli_simple_check_incoming_message; - cli->sign_info.free_signing_context = cli_simple_free_signing_context; + cli->sign_info.sign_outgoing_message = client_sign_outgoing_message; + cli->sign_info.check_incoming_message = client_check_incoming_message; + cli->sign_info.free_signing_context = simple_free_signing_context; return True; } /*********************************************************** - SMB signing - NULL implementation - calculate a MAC to send. + Tell client code we are in a multiple trans reply state. ************************************************************/ -static void cli_null_sign_outgoing_message(struct cli_state *cli) +void cli_signing_trans_start(struct cli_state *cli) { - /* we can't zero out the sig, as we might be trying to send a - session request - which is NBT-level, not SMB level and doesn't - have the field */ - return; -} + struct smb_basic_signing_context *data = cli->sign_info.signing_context; -/*********************************************************** - SMB signing - NULL implementation - check a MAC sent by server. -************************************************************/ + if (!cli->sign_info.doing_signing || !data) + return; -static BOOL cli_null_check_incoming_message(struct cli_state *cli) -{ - return True; + data->trans_info = smb_xmalloc(sizeof(struct trans_info_context)); + ZERO_STRUCTP(data->trans_info); + + data->trans_info->send_seq_num = data->send_seq_num; + data->trans_info->mid = SVAL(cli->outbuf,smb_mid); + data->trans_info->reply_seq_num = data->send_seq_num+1; + + DEBUG(10,("cli_signing_trans_start: storing mid = %u, reply_seq_num = %u, send_seq_num = %u \ +data->send_seq_num = %u\n", + (unsigned int)data->trans_info->mid, + (unsigned int)data->trans_info->reply_seq_num, + (unsigned int)data->trans_info->send_seq_num, + (unsigned int)data->send_seq_num )); } /*********************************************************** - SMB signing - NULL implementation - free signing context + Tell client code we are out of a multiple trans reply state. ************************************************************/ -static void cli_null_free_signing_context(struct cli_state *cli) +void cli_signing_trans_stop(struct cli_state *cli) { - return; -} + struct smb_basic_signing_context *data = cli->sign_info.signing_context; -/** - SMB signing - NULL implementation - setup the MAC key. + if (!cli->sign_info.doing_signing || !data) + return; - @note Used as an initialisation only - it will not correctly - shut down a real signing mechanism -*/ + SAFE_FREE(data->trans_info); + data->trans_info = NULL; -BOOL cli_null_set_signing(struct cli_state *cli) -{ - cli->sign_info.signing_context = NULL; - - cli->sign_info.sign_outgoing_message = cli_null_sign_outgoing_message; - cli->sign_info.check_incoming_message = cli_null_check_incoming_message; - cli->sign_info.free_signing_context = cli_null_free_signing_context; - - return True; + data->send_seq_num += 2; } /*********************************************************** SMB signing - TEMP implementation - calculate a MAC to send. ************************************************************/ -static void cli_temp_sign_outgoing_message(struct cli_state *cli) +static void temp_sign_outgoing_message(char *outbuf, struct smb_sign_info *si) { /* mark the packet as signed - BEFORE we sign it...*/ - cli_mark_packet_signed(cli); + mark_packet_signed(outbuf); /* I wonder what BSRSPYL stands for - but this is what MS actually sends! */ - memcpy(&cli->outbuf[smb_ss_field], "BSRSPYL ", 8); + memcpy(&outbuf[smb_ss_field], "BSRSPYL ", 8); return; } @@ -377,7 +513,7 @@ static void cli_temp_sign_outgoing_message(struct cli_state *cli) SMB signing - TEMP implementation - check a MAC sent by server. ************************************************************/ -static BOOL cli_temp_check_incoming_message(struct cli_state *cli) +static BOOL temp_check_incoming_message(char *inbuf, struct smb_sign_info *si) { return True; } @@ -386,7 +522,7 @@ static BOOL cli_temp_check_incoming_message(struct cli_state *cli) SMB signing - TEMP implementation - free signing context ************************************************************/ -static void cli_temp_free_signing_context(struct cli_state *cli) +static void temp_free_signing_context(struct smb_sign_info *si) { return; } @@ -395,6 +531,15 @@ static void cli_temp_free_signing_context(struct cli_state *cli) SMB signing - NULL implementation - setup the MAC key. ************************************************************/ +BOOL cli_null_set_signing(struct cli_state *cli) +{ + return null_set_signing(&cli->sign_info); +} + +/*********************************************************** + SMB signing - temp implementation - setup the MAC key. +************************************************************/ + BOOL cli_temp_set_signing(struct cli_state *cli) { if (!cli_set_smb_signing_common(cli)) { @@ -403,58 +548,427 @@ BOOL cli_temp_set_signing(struct cli_state *cli) cli->sign_info.signing_context = NULL; - cli->sign_info.sign_outgoing_message = cli_temp_sign_outgoing_message; - cli->sign_info.check_incoming_message = cli_temp_check_incoming_message; - cli->sign_info.free_signing_context = cli_temp_free_signing_context; + cli->sign_info.sign_outgoing_message = temp_sign_outgoing_message; + cli->sign_info.check_incoming_message = temp_check_incoming_message; + cli->sign_info.free_signing_context = temp_free_signing_context; return True; } -/** - * Free the signing context - */ - -void cli_free_signing_context(struct cli_state *cli) +void cli_free_signing_context(struct cli_state *cli) { - if (cli->sign_info.free_signing_context) - cli->sign_info.free_signing_context(cli); - - cli_null_set_signing(cli); + free_signing_context(&cli->sign_info); } /** * Sign a packet with the current mechanism */ -void cli_caclulate_sign_mac(struct cli_state *cli) +void cli_calculate_sign_mac(struct cli_state *cli) { - cli->sign_info.sign_outgoing_message(cli); + cli->sign_info.sign_outgoing_message(cli->outbuf, &cli->sign_info); } /** * Check a packet with the current mechanism * @return False if we had an established signing connection - * which had a back checksum, True otherwise + * which had a bad checksum, True otherwise. */ BOOL cli_check_sign_mac(struct cli_state *cli) { + if (!cli->sign_info.check_incoming_message(cli->inbuf, &cli->sign_info)) { + free_signing_context(&cli->sign_info); + return False; + } + return True; +} + +static BOOL packet_is_oplock_break(char *buf) +{ + if (CVAL(buf,smb_com) != SMBlockingX) + return False; + + if (CVAL(buf,smb_vwv3) != LOCKING_ANDX_OPLOCK_RELEASE) + return False; + + return True; +} + +/*********************************************************** + SMB signing - Server implementation - send the MAC. +************************************************************/ + +static void srv_sign_outgoing_message(char *outbuf, struct smb_sign_info *si) +{ + unsigned char calc_md5_mac[16]; + struct smb_basic_signing_context *data = si->signing_context; + uint32 send_seq_number = data->send_seq_num; + BOOL was_deferred_packet = False; + uint16 mid; + + if (!si->doing_signing) { + if (si->allow_smb_signing && si->negotiated_smb_signing) { + mid = SVAL(outbuf, smb_mid); + + was_deferred_packet = get_sequence_for_reply(&data->outstanding_packet_list, + mid, &send_seq_number); + if (!was_deferred_packet) { + /* + * Is this an outgoing oplock break ? If so, store the + * mid in the outstanding list. + */ + + if (packet_is_oplock_break(outbuf)) { + store_sequence_for_reply(&data->outstanding_packet_list, + mid, data->send_seq_num); + } + + data->send_seq_num++; + } + } + return; + } + + /* JRA Paranioa test - we should be able to get rid of this... */ + if (smb_len(outbuf) < (smb_ss_field + 8 - 4)) { + DEBUG(1, ("srv_sign_outgoing_message: Logic error. Can't send signature on short packet! smb_len = %u\n", + smb_len(outbuf) )); + abort(); + } + + /* mark the packet as signed - BEFORE we sign it...*/ + mark_packet_signed(outbuf); + + mid = SVAL(outbuf, smb_mid); + + /* See if this is a reply for a deferred packet. */ + was_deferred_packet = get_sequence_for_reply(&data->outstanding_packet_list, mid, &send_seq_number); + + if (data->trans_info && (data->trans_info->mid == mid)) { + /* This is a reply in a trans stream. Use the sequence + * number associated with the stream mid. */ + send_seq_number = data->trans_info->send_seq_num; + } + + simple_packet_signature(data, outbuf, send_seq_number, calc_md5_mac); + + DEBUG(10, ("srv_sign_outgoing_message: seq %u: sent SMB signature of\n", (unsigned int)send_seq_number)); + dump_data(10, calc_md5_mac, 8); + + memcpy(&outbuf[smb_ss_field], calc_md5_mac, 8); + +/* cli->outbuf[smb_ss_field+2]=0; + Uncomment this to test if the remote server actually verifies signatures...*/ + + if (!was_deferred_packet) { + if (!data->trans_info) { + /* Always increment if not in a trans stream. */ + data->send_seq_num++; + } else if ((data->trans_info->send_seq_num == data->send_seq_num) || (data->trans_info->mid != mid)) { + /* Increment if this is the first reply in a trans stream or a + * packet that doesn't belong to this stream (different mid). */ + data->send_seq_num++; + } + } +} + +/*********************************************************** + SMB signing - Server implementation - check a MAC sent by server. +************************************************************/ + +static BOOL srv_check_incoming_message(char *inbuf, struct smb_sign_info *si) +{ BOOL good; + struct smb_basic_signing_context *data = si->signing_context; + uint32 reply_seq_number = data->send_seq_num; + unsigned char calc_md5_mac[16]; + unsigned char *server_sent_mac; + uint mid; + + if (!si->doing_signing) + return True; - if (smb_len(cli->inbuf) < (smb_ss_field + 8 - 4)) { - DEBUG(cli->sign_info.doing_signing ? 1 : 10, ("Can't check signature on short packet! smb_len = %u\n", smb_len(cli->inbuf))); - good = False; + if (smb_len(inbuf) < (smb_ss_field + 8 - 4)) { + DEBUG(1, ("srv_check_incoming_message: Can't check signature on short packet! smb_len = %u\n", smb_len(inbuf))); + return False; + } + + mid = SVAL(inbuf, smb_mid); + + /* Is this part of a trans stream ? */ + if (data->trans_info && (data->trans_info->mid == mid)) { + /* If so we don't increment the sequence. */ + reply_seq_number = data->trans_info->reply_seq_num; } else { - good = cli->sign_info.check_incoming_message(cli); + /* We always increment the sequence number. */ + data->send_seq_num++; + /* Oplock break requests store an outgoing mid in the packet list. */ + if (packet_is_oplock_break(inbuf)) + get_sequence_for_reply(&data->outstanding_packet_list, mid, &reply_seq_number); } + simple_packet_signature(data, inbuf, reply_seq_number, calc_md5_mac); + + server_sent_mac = &inbuf[smb_ss_field]; + good = (memcmp(server_sent_mac, calc_md5_mac, 8) == 0); + if (!good) { - if (cli->sign_info.doing_signing) { - return False; - } else { - cli_free_signing_context(cli); + + DEBUG(5, ("srv_check_incoming_message: BAD SIG: wanted SMB signature of\n")); + dump_data(5, calc_md5_mac, 8); + + DEBUG(5, ("srv_check_incoming_message: BAD SIG: got SMB signature of\n")); + dump_data(5, server_sent_mac, 8); + +#if 1 /* JRATEST */ + { + int i; + reply_seq_number -= 5; + for (i = 0; i < 10; i++, reply_seq_number++) { + simple_packet_signature(data, inbuf, reply_seq_number, calc_md5_mac); + if (memcmp(server_sent_mac, calc_md5_mac, 8) == 0) { + DEBUG(0,("srv_check_incoming_message: out of seq. seq num %u matches.\n", + reply_seq_number )); + break; + } + } } +#endif /* JRATEST */ + + } else { + DEBUG(10, ("srv_check_incoming_message: seq %u: got good SMB signature of\n", (unsigned int)reply_seq_number)); + dump_data(10, server_sent_mac, 8); } + return signing_good(inbuf, si, good); +} - return True; +/*********************************************************** + SMB signing - server API's. +************************************************************/ + +static struct smb_sign_info srv_sign_info = { + null_sign_outgoing_message, + null_check_incoming_message, + null_free_signing_context, + NULL, + False, + False, + False, + False +}; + +/*********************************************************** + Turn signing off or on for oplock break code. +************************************************************/ + +BOOL srv_oplock_set_signing(BOOL onoff) +{ + BOOL ret = srv_sign_info.doing_signing; + srv_sign_info.doing_signing = onoff; + return ret; +} + +/*********************************************************** + Called to validate an incoming packet from the client. +************************************************************/ + +BOOL srv_check_sign_mac(char *inbuf) +{ + /* Check if it's a session keepalive. */ + if(CVAL(inbuf,0) == SMBkeepalive) + return True; + + return srv_sign_info.check_incoming_message(inbuf, &srv_sign_info); +} + +/*********************************************************** + Called to sign an outgoing packet to the client. +************************************************************/ + +void srv_calculate_sign_mac(char *outbuf) +{ + /* Check if it's a session keepalive. */ + /* JRA Paranioa test - do we ever generate these in the server ? */ + if(CVAL(outbuf,0) == SMBkeepalive) + return; + + srv_sign_info.sign_outgoing_message(outbuf, &srv_sign_info); +} + +/*********************************************************** + Called by server to defer an outgoing packet. +************************************************************/ + +void srv_defer_sign_response(uint16 mid) +{ + struct smb_basic_signing_context *data; + + if (!srv_sign_info.doing_signing) + return; + + data = (struct smb_basic_signing_context *)srv_sign_info.signing_context; + + if (!data) + return; + + store_sequence_for_reply(&data->outstanding_packet_list, + mid, data->send_seq_num); + data->send_seq_num++; +} + +/*********************************************************** + Called to remove sequence records when a deferred packet is + cancelled by mid. This should never find one.... +************************************************************/ + +void srv_cancel_sign_response(uint16 mid) +{ + struct smb_basic_signing_context *data; + uint32 dummy_seq; + + if (!srv_sign_info.doing_signing) + return; + + data = (struct smb_basic_signing_context *)srv_sign_info.signing_context; + + if (!data) + return; + + DEBUG(10,("srv_cancel_sign_response: for mid %u\n", (unsigned int)mid )); + + while (get_sequence_for_reply(&data->outstanding_packet_list, mid, &dummy_seq)) + ; +} + +/*********************************************************** + Called by server negprot when signing has been negotiated. +************************************************************/ + +void srv_set_signing_negotiated(void) +{ + srv_sign_info.allow_smb_signing = True; + srv_sign_info.negotiated_smb_signing = True; + if (lp_server_signing() == Required) + srv_sign_info.mandatory_signing = True; + + srv_sign_info.sign_outgoing_message = temp_sign_outgoing_message; + srv_sign_info.check_incoming_message = temp_check_incoming_message; + srv_sign_info.free_signing_context = temp_free_signing_context; +} + +/*********************************************************** + Returns whether signing is active. We can't use sendfile or raw + reads/writes if it is. +************************************************************/ + +BOOL srv_is_signing_active(void) +{ + return srv_sign_info.doing_signing; +} + +/*********************************************************** + Tell server code we are in a multiple trans reply state. +************************************************************/ + +void srv_signing_trans_start(uint16 mid) +{ + struct smb_basic_signing_context *data; + + if (!srv_sign_info.doing_signing) + return; + + data = (struct smb_basic_signing_context *)srv_sign_info.signing_context; + if (!data) + return; + + data->trans_info = smb_xmalloc(sizeof(struct trans_info_context)); + ZERO_STRUCTP(data->trans_info); + + data->trans_info->reply_seq_num = data->send_seq_num-1; + data->trans_info->mid = mid; + data->trans_info->send_seq_num = data->send_seq_num; + + DEBUG(10,("srv_signing_trans_start: storing mid = %u, reply_seq_num = %u, send_seq_num = %u \ +data->send_seq_num = %u\n", + (unsigned int)mid, + (unsigned int)data->trans_info->reply_seq_num, + (unsigned int)data->trans_info->send_seq_num, + (unsigned int)data->send_seq_num )); +} + +/*********************************************************** + Tell server code we are out of a multiple trans reply state. +************************************************************/ + +void srv_signing_trans_stop(void) +{ + struct smb_basic_signing_context *data; + + if (!srv_sign_info.doing_signing) + return; + + data = (struct smb_basic_signing_context *)srv_sign_info.signing_context; + if (!data || !data->trans_info) + return; + + DEBUG(10,("srv_signing_trans_stop: removing mid = %u, reply_seq_num = %u, send_seq_num = %u \ +data->send_seq_num = %u\n", + (unsigned int)data->trans_info->mid, + (unsigned int)data->trans_info->reply_seq_num, + (unsigned int)data->trans_info->send_seq_num, + (unsigned int)data->send_seq_num )); + + SAFE_FREE(data->trans_info); + data->trans_info = NULL; +} + +/*********************************************************** + Turn on signing from this packet onwards. +************************************************************/ + +void srv_set_signing(const uchar user_session_key[16], const DATA_BLOB response) +{ + struct smb_basic_signing_context *data; + + if (!user_session_key) + return; + + if (!srv_sign_info.negotiated_smb_signing && !srv_sign_info.mandatory_signing) { + DEBUG(5,("srv_set_signing: signing negotiated = %u, mandatory_signing = %u. Not allowing smb signing.\n", + (unsigned int)srv_sign_info.negotiated_smb_signing, + (unsigned int)srv_sign_info.mandatory_signing )); + return; + } + + /* Once we've turned on, ignore any more sessionsetups. */ + if (srv_sign_info.doing_signing) { + return; + } + + if (srv_sign_info.free_signing_context) + srv_sign_info.free_signing_context(&srv_sign_info); + + srv_sign_info.doing_signing = True; + + data = smb_xmalloc(sizeof(*data)); + memset(data, '\0', sizeof(*data)); + + srv_sign_info.signing_context = data; + + data->mac_key = data_blob(NULL, response.length + 16); + + memcpy(&data->mac_key.data[0], user_session_key, 16); + if (response.length) + memcpy(&data->mac_key.data[16],response.data, response.length); + + /* Initialise the sequence number */ + data->send_seq_num = 0; + + /* Initialise the list of outstanding packets */ + data->outstanding_packet_list = NULL; + + srv_sign_info.sign_outgoing_message = srv_sign_outgoing_message; + srv_sign_info.check_incoming_message = srv_check_incoming_message; + srv_sign_info.free_signing_context = simple_free_signing_context; } |