diff options
Diffstat (limited to 'source3/libsmb/smb_signing.c')
-rw-r--r-- | source3/libsmb/smb_signing.c | 136 |
1 files changed, 114 insertions, 22 deletions
diff --git a/source3/libsmb/smb_signing.c b/source3/libsmb/smb_signing.c index 19450a9536..36c4147af8 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 @@ -219,6 +219,8 @@ 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); @@ -249,10 +251,10 @@ static void simple_packet_signature(struct smb_basic_signing_context *data, /*********************************************************** - SMB signing - Simple implementation - send the MAC. + SMB signing - Client implementation - send the MAC. ************************************************************/ -static void simple_sign_outgoing_message(char *outbuf, struct smb_sign_info *si) +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 = si->signing_context; @@ -262,7 +264,7 @@ static void simple_sign_outgoing_message(char *outbuf, struct smb_sign_info *si) /* JRA Paranioa test - we should be able to get rid of this... */ if (smb_len(outbuf) < (smb_ss_field + 8 - 4)) { - DEBUG(1, ("simple_sign_outgoing_message: Logic error. Can't check signature on short packet! smb_len = %u\n", + DEBUG(1, ("client_sign_outgoing_message: Logic error. Can't check signature on short packet! smb_len = %u\n", smb_len(outbuf) )); abort(); } @@ -272,7 +274,7 @@ static void simple_sign_outgoing_message(char *outbuf, struct smb_sign_info *si) simple_packet_signature(data, outbuf, data->send_seq_num, calc_md5_mac); - DEBUG(10, ("simple_sign_outgoing_message: sent SMB signature of\n")); + DEBUG(10, ("client_sign_outgoing_message: sent SMB signature of\n")); dump_data(10, calc_md5_mac, 8); memcpy(&outbuf[smb_ss_field], calc_md5_mac, 8); @@ -281,19 +283,17 @@ static void simple_sign_outgoing_message(char *outbuf, struct smb_sign_info *si) Uncomment this to test if the remote server actually verifies signatures...*/ data->send_seq_num++; -#if 1 /* JRATEST */ store_sequence_for_reply(&data->outstanding_packet_list, SVAL(outbuf,smb_mid), data->send_seq_num); data->send_seq_num++; -#endif /* JRATEST */ } /*********************************************************** - SMB signing - Simple implementation - check a MAC sent by server. + SMB signing - Client implementation - check a MAC sent by server. ************************************************************/ -static BOOL simple_check_incoming_message(char *inbuf, struct smb_sign_info *si) +static BOOL client_check_incoming_message(char *inbuf, struct smb_sign_info *si) { BOOL good; uint32 reply_seq_number; @@ -306,20 +306,15 @@ static BOOL simple_check_incoming_message(char *inbuf, struct smb_sign_info *si) return True; if (smb_len(inbuf) < (smb_ss_field + 8 - 4)) { - DEBUG(1, ("simple_check_incoming_message: Can't check signature on short packet! smb_len = %u\n", smb_len(inbuf))); + DEBUG(1, ("client_check_incoming_message: Can't check signature on short packet! smb_len = %u\n", smb_len(inbuf))); return False; } -#if 1 /* JRATEST */ if (!get_sequence_for_reply(&data->outstanding_packet_list, SVAL(inbuf, smb_mid), &reply_seq_number)) { return False; } -#else /* JRATEST */ - reply_seq_number = data->send_seq_num; - data->send_seq_num++; -#endif /* JRATEST */ simple_packet_signature(data, inbuf, reply_seq_number, calc_md5_mac); @@ -327,10 +322,10 @@ static BOOL simple_check_incoming_message(char *inbuf, struct smb_sign_info *si) good = (memcmp(server_sent_mac, calc_md5_mac, 8) == 0); if (!good) { - DEBUG(5, ("simple_check_incoming_message: 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, ("simple_check_incoming_message: 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); } return signing_good(inbuf, si, good); @@ -383,8 +378,17 @@ BOOL cli_simple_set_signing(struct cli_state *cli, const uchar user_session_key[ data->mac_key = data_blob(NULL, response.length + 16); memcpy(&data->mac_key.data[0], user_session_key, 16); - if (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; @@ -392,8 +396,8 @@ 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 = simple_sign_outgoing_message; - cli->sign_info.check_incoming_message = simple_check_incoming_message; + 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; @@ -490,6 +494,94 @@ BOOL cli_check_sign_mac(struct cli_state *cli) } /*********************************************************** + 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; + + 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, ("srv_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...*/ + mark_packet_signed(outbuf); + + simple_packet_signature(data, outbuf, data->send_seq_num, calc_md5_mac); + + DEBUG(10, ("srv_sign_outgoing_message: sent SMB signature of\n")); + 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...*/ + + data->send_seq_num++; +#if 0 /* JRATEST */ + store_sequence_for_reply(&data->outstanding_packet_list, + SVAL(outbuf,smb_mid), + data->send_seq_num); + data->send_seq_num++; +#endif /* JRATEST */ +} + +/*********************************************************** + 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; + uint32 reply_seq_number; + unsigned char calc_md5_mac[16]; + unsigned char *server_sent_mac; + + struct smb_basic_signing_context *data = si->signing_context; + + if (!si->doing_signing) + return True; + + 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; + } + +#if 0 /* JRATEST */ + if (!get_sequence_for_reply(&data->outstanding_packet_list, + SVAL(inbuf, smb_mid), + &reply_seq_number)) { + return False; + } +#else /* JRATEST */ + reply_seq_number = data->send_seq_num; + data->send_seq_num++; +#endif /* JRATEST */ + + 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) { + 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); + } + return signing_good(inbuf, si, good); +} + +/*********************************************************** SMB signing - server API's. ************************************************************/ @@ -612,7 +704,7 @@ void srv_set_signing(const uchar user_session_key[16], const DATA_BLOB response) /* Initialise the list of outstanding packets */ data->outstanding_packet_list = NULL; - srv_sign_info.sign_outgoing_message = simple_sign_outgoing_message; - srv_sign_info.check_incoming_message = simple_check_incoming_message; + 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; } |