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https://github.com/zeek/zeek.git
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Apply requested changes:
- file dpd.sig and TODO comments for signature protocol detection removed - missing doc field filled in events.bif - rename OpCode and ReqCode fields into op_code and req_code respectively - removed unnecessary child method in NTP.h/.cc - main.zeek and ntp-protocol.pac reformatted
This commit is contained in:
Mauro Palumbo
parent
b130cc7931
commit
32663cec04
8 changed files with 229 additions and 248 deletions
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@ -4995,7 +4995,7 @@ export {
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## 6 set trap address/port command/response
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## 7 trap response
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## Other values are reserved.
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OpCode : count;
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op_code : count;
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## The response bit. Set to zero for commands, one for responses.
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resp_bit : bool;
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## The error bit. Set to zero for normal response, one for error response.
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@ -5029,7 +5029,7 @@ export {
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## An implementation-specific code which specifies the
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## operation to be (which has been) performed and/or the
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## format and semantics of the data included in the packet.
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ReqCode : count;
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req_code : count;
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## The authenticated bit. If set, this packet is authenticated.
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auth_bit : bool;
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## For a multipacket response, contains the sequence
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@ -1,2 +1 @@
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@load ./main
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#@load-sigs ./dpd.sig
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@ -1,12 +0,0 @@
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signature dpd_ntp {
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ip-proto == udp
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# ## TODO: Define the payload. When Bro sees this regex, on
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# ## any port, it will enable your analyzer on that
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# ## connection.
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# ## payload /^NTP/
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enable "ntp"
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}
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@ -1,138 +1,137 @@
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module NTP;
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# TODO: The recommended method to do dynamic protocol detection
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# (DPD) is with the signatures in dpd.sig.
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# For the time being, we use port detection.
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const ports = { 123/udp };
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redef likely_server_ports += { ports };
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export {
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redef enum Log::ID += { LOG };
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redef enum Log::ID += { LOG };
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type Info: record {
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## Timestamp for when the event happened.
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ts: time &log;
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## Unique ID for the connection.
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uid: string &log;
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## The connection's 4-tuple of endpoint addresses/ports.
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id: conn_id &log;
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type Info: record {
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## Timestamp for when the event happened.
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ts: time &log;
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## Unique ID for the connection.
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uid: string &log;
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## The connection's 4-tuple of endpoint addresses/ports.
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id: conn_id &log;
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## The NTP version number (1, 2, 3, 4)
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version: count &log;
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## The NTP mode being used
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mode: count &log;
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## The stratum (primary server, secondary server, etc.)
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stratum: count &log;
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## The maximum interval between successive messages
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poll: interval &log;
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## The precision of the system clock
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precision: interval &log;
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## Total round-trip delay to the reference clock
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root_delay: interval &log;
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## Total dispersion to the reference clock
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root_disp: interval &log;
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## For stratum 0, 4 character string used for debugging
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kiss_code: string &optional &log;
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## For stratum 1, ID assigned to the reference clock by IANA
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ref_id: string &optional &log;
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## Above stratum 1, when using IPv4, the IP address of the reference clock
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ref_addr: addr &optional &log;
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## Above stratum 1, when using IPv6, the first four bytes of the MD5 hash of the
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## IPv6 address of the reference clock
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ref_v6_hash_prefix: string &optional &log;
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## Time when the system clock was last set or correct
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ref_time: time &log;
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## Time at the client when the request departed for the NTP server
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org_time: time &log;
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## Time at the server when the request arrived from the NTP client
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rec_time: time &log;
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## Time at the server when the response departed for the NTP client
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xmt_time: time &log;
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## Key used to designate a secret MD5 key
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key_id: count &optional &log;
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## MD5 hash computed over the key followed by the NTP packet header and extension fields
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digest: string &optional &log;
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## Number of extension fields (which are not currently parsed)
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num_exts: count &default=0 &log;
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version: count &log;
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## The NTP mode being used
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mode: count &log;
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## The stratum (primary server, secondary server, etc.)
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stratum: count &log;
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## The maximum interval between successive messages
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poll: interval &log;
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## The precision of the system clock
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precision: interval &log;
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## Total round-trip delay to the reference clock
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root_delay: interval &log;
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## Total dispersion to the reference clock
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root_disp: interval &log;
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## For stratum 0, 4 character string used for debugging
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kiss_code: string &optional &log;
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## For stratum 1, ID assigned to the reference clock by IANA
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ref_id: string &optional &log;
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## Above stratum 1, when using IPv4, the IP address of the reference clock
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ref_addr: addr &optional &log;
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## Above stratum 1, when using IPv6, the first four bytes of the MD5 hash of the
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## IPv6 address of the reference clock
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ref_v6_hash_prefix: string &optional &log;
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## Time when the system clock was last set or correct
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ref_time: time &log;
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## Time at the client when the request departed for the NTP server
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org_time: time &log;
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## Time at the server when the request arrived from the NTP client
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rec_time: time &log;
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## Time at the server when the response departed for the NTP client
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xmt_time: time &log;
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## Key used to designate a secret MD5 key
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key_id: count &optional &log;
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## MD5 hash computed over the key followed by the NTP packet header and extension fields
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digest: string &optional &log;
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## Number of extension fields (which are not currently parsed)
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num_exts: count &default=0 &log;
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## An integer specifying the command function. Values currently defined includes:
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## 1 read status command/response
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## 2 read variables command/response
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## 3 write variables command/response
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## 4 read clock variables command/response
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## 5 write clock variables command/response
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## 6 set trap address/port command/response
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## 7 trap response
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## Other values are reserved.
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OpCode : count &log;
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## The response bit. Set to zero for commands, one for responses.
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resp_bit : bool &log;
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## The error bit. Set to zero for normal response, one for error response.
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err_bit : bool &log;
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## The more bit. Set to zero for last fragment, one for all others.
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more_bit : bool &log;
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## The sequence number of the command or response
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sequence : count &log;
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## The current status of the system, peer or clock
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status : count &log;
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## A 16-bit integer identifying a valid association
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association_id : count &log;
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## This is an integer identifying the cryptographic
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## key used to generate the message-authentication code
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ctrl_key_id : count &optional &log;
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## This is a crypto-checksum computed by the encryption procedure
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crypto_checksum : string &optional &log;
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## An integer specifying the command function. Values currently defined includes:
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## 1 read status command/response
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## 2 read variables command/response
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## 3 write variables command/response
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## 4 read clock variables command/response
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## 5 write clock variables command/response
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## 6 set trap address/port command/response
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## 7 trap response
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## Other values are reserved.
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op_code : count &log;
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## The response bit. Set to zero for commands, one for responses.
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resp_bit : bool &log;
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## The error bit. Set to zero for normal response, one for error response.
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err_bit : bool &log;
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## The more bit. Set to zero for last fragment, one for all others.
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more_bit : bool &log;
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## The sequence number of the command or response
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sequence : count &log;
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## The current status of the system, peer or clock
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status : count &log;
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## A 16-bit integer identifying a valid association
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association_id : count &log;
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## This is an integer identifying the cryptographic
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## key used to generate the message-authentication code
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ctrl_key_id : count &optional &log;
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## This is a crypto-checksum computed by the encryption procedure
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crypto_checksum : string &optional &log;
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## An implementation-specific code which specifies the
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## operation to be (which has been) performed and/or the
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## format and semantics of the data included in the packet.
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ReqCode : count &log;
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## The authenticated bit. If set, this packet is authenticated.
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auth_bit : bool &log;
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## For a multipacket response, contains the sequence
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## number of this packet. 0 is the first in the sequence,
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## 127 (or less) is the last. The More Bit must be set in
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## all packets but the last.
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sequence : count &log;
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## The number of the implementation this request code
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## is defined by. An implementation number of zero is used
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## for requst codes/data formats which all implementations
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## agree on. Implementation number 255 is reserved (for
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## extensions, in case we run out).
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implementation : count &log;
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## Must be 0 for a request. For a response, holds an error
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## code relating to the request. If nonzero, the operation
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## requested wasn't performed.
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##
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## 0 - no error
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## 1 - incompatible implementation number
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## 2 - unimplemented request code
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## 3 - format error (wrong data items, data size, packet size etc.)
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## 4 - no data available (e.g. request for details on unknown peer)
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## 5-6 I don't know
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## 7 - authentication failure (i.e. permission denied)
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err : count &log;
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req_code : count &log;
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## The authenticated bit. If set, this packet is authenticated.
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auth_bit : bool &log;
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## For a multipacket response, contains the sequence
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## number of this packet. 0 is the first in the sequence,
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## 127 (or less) is the last. The More Bit must be set in
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## all packets but the last.
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sequence : count &log;
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## The number of the implementation this request code
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## is defined by. An implementation number of zero is used
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## for requst codes/data formats which all implementations
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## agree on. Implementation number 255 is reserved (for
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## extensions, in case we run out).
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implementation : count &log;
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## Must be 0 for a request. For a response, holds an error
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## code relating to the request. If nonzero, the operation
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## requested wasn't performed.
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##
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## 0 - no error
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## 1 - incompatible implementation number
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## 2 - unimplemented request code
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## 3 - format error (wrong data items, data size, packet size etc.)
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## 4 - no data available (e.g. request for details on unknown peer)
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## 5-6 I don't know
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## 7 - authentication failure (i.e. permission denied)
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err : count &log;
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};
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## Event that can be handled to access the NTP record as it is sent on
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## to the logging framework.
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global log_ntp: event(rec: Info);
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## Event that can be handled to access the NTP record as it is sent on
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## to the logging framework.
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global log_ntp: event(rec: Info);
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}
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redef record connection += {
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ntp: Info &optional;
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ntp: Info &optional;
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};
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event ntp_message(c: connection, is_orig: bool, msg: NTP::Message) &priority=5
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{
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{
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local info: Info;
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info$ts = network_time();
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info$uid = c$uid;
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info$id = c$id;
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info$version = msg$version;
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info$mode = msg$mode;
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info$ts = network_time();
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info$uid = c$uid;
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info$id = c$id;
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info$version = msg$version;
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info$mode = msg$mode;
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if ( msg$mode < 6 ) {
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if ( msg$mode < 6 )
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{
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info$stratum = msg$std_msg$stratum;
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info$poll = msg$std_msg$poll;
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info$precision = msg$std_msg$precision;
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@ -141,69 +140,70 @@ event ntp_message(c: connection, is_orig: bool, msg: NTP::Message) &priority=5
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if ( msg$std_msg?$kiss_code)
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info$kiss_code = msg$std_msg$kiss_code;
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if ( msg$std_msg?$ref_id)
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info$ref_id = msg$std_msg$ref_id;
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if ( msg$std_msg?$ref_addr)
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info$ref_addr = msg$std_msg$ref_addr;
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if ( msg$std_msg?$ref_v6_hash_prefix)
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info$ref_v6_hash_prefix = msg$std_msg$ref_v6_hash_prefix;
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if ( msg$std_msg?$ref_id)
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info$ref_id = msg$std_msg$ref_id;
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if ( msg$std_msg?$ref_addr)
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info$ref_addr = msg$std_msg$ref_addr;
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if ( msg$std_msg?$ref_v6_hash_prefix)
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info$ref_v6_hash_prefix = msg$std_msg$ref_v6_hash_prefix;
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info$ref_time = msg$std_msg$ref_time;
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info$org_time = msg$std_msg$org_time;
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info$rec_time = msg$std_msg$rec_time;
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info$xmt_time = msg$std_msg$xmt_time;
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info$ref_time = msg$std_msg$ref_time;
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info$org_time = msg$std_msg$org_time;
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info$rec_time = msg$std_msg$rec_time;
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info$xmt_time = msg$std_msg$xmt_time;
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if ( msg$std_msg?$key_id)
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info$key_id = msg$std_msg$key_id;
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if ( msg$std_msg?$digest)
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info$digest = msg$std_msg$digest;
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if ( msg$std_msg?$key_id)
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info$key_id = msg$std_msg$key_id;
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if ( msg$std_msg?$digest)
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info$digest = msg$std_msg$digest;
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info$num_exts = msg$std_msg$num_exts;
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}
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}
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if ( msg$mode==6 ) {
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info$OpCode = msg$control_msg$OpCode;
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info$resp_bit = msg$control_msg$resp_bit;
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info$err_bit = msg$control_msg$err_bit;
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info$more_bit = msg$control_msg$more_bit;
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info$sequence = msg$control_msg$sequence;
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info$status = msg$control_msg$status;
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info$association_id = msg$control_msg$association_id;
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if ( msg$mode==6 )
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{
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info$op_code = msg$control_msg$op_code;
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info$resp_bit = msg$control_msg$resp_bit;
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info$err_bit = msg$control_msg$err_bit;
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info$more_bit = msg$control_msg$more_bit;
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info$sequence = msg$control_msg$sequence;
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info$status = msg$control_msg$status;
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info$association_id = msg$control_msg$association_id;
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if ( msg$control_msg?$key_id)
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info$ctrl_key_id = msg$control_msg$key_id;
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if ( msg$control_msg?$crypto_checksum)
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info$crypto_checksum = msg$control_msg$crypto_checksum;
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if ( msg$control_msg?$key_id)
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info$ctrl_key_id = msg$control_msg$key_id;
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if ( msg$control_msg?$crypto_checksum)
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info$crypto_checksum = msg$control_msg$crypto_checksum;
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}
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}
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if ( msg$mode==7 )
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{
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info$req_code = msg$mode7_msg$req_code;
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info$auth_bit = msg$mode7_msg$auth_bit;
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info$sequence = msg$mode7_msg$sequence;
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info$implementation = msg$mode7_msg$implementation;
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info$err = msg$mode7_msg$err;
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}
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if ( msg$mode==7 ) {
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info$ReqCode = msg$mode7_msg$ReqCode;
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info$auth_bit = msg$mode7_msg$auth_bit;
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info$sequence = msg$mode7_msg$sequence;
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info$implementation = msg$mode7_msg$implementation;
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info$err = msg$mode7_msg$err;
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}
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# Copy the present packet info into the connection record
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# Copy the present packet info into the connection record
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# If more ntp packets are sent on the same connection, the newest one
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# will overwrite the previous
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c$ntp = info;
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# Add the service to the Conn::LOG
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add c$service["ntp"];
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}
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}
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event ntp_message(c: connection, is_orig: bool, msg: NTP::Message) &priority=-5
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{
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# Log every ntp packet into ntp.log
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Log::write(NTP::LOG, c$ntp);
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}
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{
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# Log every ntp packet into ntp.log
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Log::write(NTP::LOG, c$ntp);
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}
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event zeek_init() &priority=5
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{
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Analyzer::register_for_ports(Analyzer::ANALYZER_NTP, ports);
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{
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Analyzer::register_for_ports(Analyzer::ANALYZER_NTP, ports);
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Log::create_stream(NTP::LOG, [$columns = Info, $ev = log_ntp]);
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}
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Log::create_stream(NTP::LOG, [$columns = Info, $ev = log_ntp]);
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}
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@ -17,11 +17,6 @@ NTP_Analyzer::~NTP_Analyzer()
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delete interp;
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}
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void NTP_Analyzer::Done()
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{
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Analyzer::Done();
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}
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void NTP_Analyzer::DeliverPacket(int len, const u_char* data,
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bool orig, uint64 seq, const IP_Hdr* ip, int caplen)
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{
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@ -16,7 +16,6 @@ public:
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~NTP_Analyzer() override;
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// Overriden from Analyzer.
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void Done() override;
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void DeliverPacket(int len, const u_char* data, bool orig,
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uint64 seq, const IP_Hdr* ip, int caplen) override;
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@ -6,7 +6,7 @@
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##
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## c: The connection record describing the corresponding UDP flow.
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##
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## is_orig:
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## is_orig: True if the message was sent by the originator.
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##
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## msg: The parsed NTP message.
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##
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@ -3,52 +3,52 @@
|
|||
type NTP_PDU(is_orig: bool) = record {
|
||||
# The first byte of the NTP header contains the leap indicator,
|
||||
# the version and the mode
|
||||
first_byte : uint8;
|
||||
# Modes 1-5 are standard NTP time sync
|
||||
standard_modes : case (mode>=1 && mode<=5) of {
|
||||
true -> std : NTP_std_msg;
|
||||
false -> emp : empty;
|
||||
};
|
||||
modes_6_7 : case (mode) of {
|
||||
first_byte : uint8;
|
||||
# Modes 1-5 are standard NTP time sync
|
||||
standard_modes : case (mode>=1 && mode<=5) of {
|
||||
true -> std : NTP_std_msg;
|
||||
false -> emp : empty;
|
||||
};
|
||||
modes_6_7 : case (mode) of {
|
||||
# mode 6 is for control messages (format is different from modes 6-7)
|
||||
6 -> control : NTP_control_msg;
|
||||
6 -> control : NTP_control_msg;
|
||||
# mode 7 is reserved or private (and implementation dependent). For example used for some commands such as MONLIST
|
||||
7 -> mode7 : NTP_mode7_msg;
|
||||
default -> unknown : bytestring &restofdata;
|
||||
};
|
||||
7 -> mode7 : NTP_mode7_msg;
|
||||
default -> unknown : bytestring &restofdata;
|
||||
};
|
||||
} &let {
|
||||
leap : uint8 = (first_byte & 0xc0)>>6; # First 2 bits of 8-bits value
|
||||
version : uint8 = (first_byte & 0x38)>>3; # Bits 3-5 of 8-bits value
|
||||
mode : uint8 = (first_byte & 0x07); # Bits 6-8 of 8-bits value
|
||||
leap : uint8 = (first_byte & 0xc0)>>6; # First 2 bits of 8-bits value
|
||||
version : uint8 = (first_byte & 0x38)>>3; # Bits 3-5 of 8-bits value
|
||||
mode : uint8 = (first_byte & 0x07); # Bits 6-8 of 8-bits value
|
||||
} &byteorder=bigendian &exportsourcedata;
|
||||
|
||||
# This is the most common type of message, corresponding to modes 1-5
|
||||
# This kind of msg are used for normal operation of syncronization
|
||||
# See RFC 5905 for details
|
||||
type NTP_std_msg = record {
|
||||
stratum : uint8;
|
||||
poll : int8;
|
||||
precision : int8;
|
||||
stratum : uint8;
|
||||
poll : int8;
|
||||
precision : int8;
|
||||
|
||||
root_delay : NTP_Short_Time;
|
||||
root_dispersion: NTP_Short_Time;
|
||||
reference_id : bytestring &length=4;
|
||||
reference_ts : NTP_Time;
|
||||
root_delay : NTP_Short_Time;
|
||||
root_dispersion : NTP_Short_Time;
|
||||
reference_id : bytestring &length=4;
|
||||
reference_ts : NTP_Time;
|
||||
|
||||
origin_ts : NTP_Time;
|
||||
receive_ts : NTP_Time;
|
||||
transmit_ts : NTP_Time;
|
||||
extensions : case (has_exts) of {
|
||||
true -> exts : Extension_Field[] &until($input.length() > 24);
|
||||
false -> nil : empty;
|
||||
} &requires(has_exts);
|
||||
mac_fields : case (mac_len) of {
|
||||
20 -> mac : NTP_MAC;
|
||||
24 -> mac_ext : NTP_MAC_ext;
|
||||
default -> nil2 : empty;
|
||||
} &requires(mac_len);
|
||||
origin_ts : NTP_Time;
|
||||
receive_ts : NTP_Time;
|
||||
transmit_ts : NTP_Time;
|
||||
extensions : case (has_exts) of {
|
||||
true -> exts : Extension_Field[] &until($input.length() > 24);
|
||||
false -> nil : empty;
|
||||
} &requires(has_exts);
|
||||
mac_fields : case (mac_len) of {
|
||||
20 -> mac : NTP_MAC;
|
||||
24 -> mac_ext : NTP_MAC_ext;
|
||||
default -> nil2 : empty;
|
||||
} &requires(mac_len);
|
||||
} &let {
|
||||
length = sourcedata.length();
|
||||
length = sourcedata.length();
|
||||
has_exts: bool = (length - offsetof(extensions)) > 24;
|
||||
mac_len: uint32 = (length - offsetof(mac_fields));
|
||||
} &byteorder=bigendian &exportsourcedata;
|
||||
|
|
@ -56,24 +56,24 @@ type NTP_std_msg = record {
|
|||
# This format is for mode==6, control msg
|
||||
# See RFC 1119 for details
|
||||
type NTP_control_msg = record {
|
||||
second_byte : uint8;
|
||||
sequence : uint16;
|
||||
status : uint16; #TODO: this can be further parsed internally
|
||||
association_id : uint16;
|
||||
offs : uint16;
|
||||
c : uint16;
|
||||
second_byte : uint8;
|
||||
sequence : uint16;
|
||||
status : uint16; #TODO: this can be further parsed internally
|
||||
association_id : uint16;
|
||||
offs : uint16;
|
||||
c : uint16;
|
||||
data : bytestring &length=c;
|
||||
mac_fields : case (has_control_mac) of {
|
||||
true -> mac : NTP_CONTROL_MAC;
|
||||
false -> nil : empty;
|
||||
} &requires(has_control_mac);
|
||||
mac_fields : case (has_control_mac) of {
|
||||
true -> mac : NTP_CONTROL_MAC;
|
||||
false -> nil : empty;
|
||||
} &requires(has_control_mac);
|
||||
} &let {
|
||||
R : bool = (second_byte & 0x80) > 0; # First bit of 8-bits value
|
||||
E : bool = (second_byte & 0x40) > 0; # Second bit of 8-bits value
|
||||
M : bool = (second_byte & 0x20) > 0; # Third bit of 8-bits value
|
||||
OpCode : uint8 = (second_byte & 0x1F); # Last 5 bits of 8-bits value
|
||||
length = sourcedata.length();
|
||||
has_control_mac: bool = (length - offsetof(mac_fields)) == 12;
|
||||
R : bool = (second_byte & 0x80) > 0; # First bit of 8-bits value
|
||||
E : bool = (second_byte & 0x40) > 0; # Second bit of 8-bits value
|
||||
M : bool = (second_byte & 0x20) > 0; # Third bit of 8-bits value
|
||||
OpCode : uint8 = (second_byte & 0x1F); # Last 5 bits of 8-bits value
|
||||
length = sourcedata.length();
|
||||
has_control_mac: bool = (length - offsetof(mac_fields)) == 12;
|
||||
} &byteorder=bigendian &exportsourcedata;
|
||||
|
||||
# As in RFC 5905
|
||||
|
|
@ -90,35 +90,35 @@ type NTP_MAC_ext = record {
|
|||
|
||||
# As in RFC 1119
|
||||
type NTP_CONTROL_MAC = record {
|
||||
key_id : uint32;
|
||||
crypto_checksum : bytestring &length=8;
|
||||
key_id : uint32;
|
||||
crypto_checksum : bytestring &length=8;
|
||||
} &length=12;
|
||||
|
||||
# As defined in RFC 5906
|
||||
type Extension_Field = record {
|
||||
first_byte_ext: uint8;
|
||||
field_type : uint8;
|
||||
len : uint16;
|
||||
association_id: uint16;
|
||||
timestamp : uint32;
|
||||
filestamp : uint32;
|
||||
value_len : uint32;
|
||||
value : bytestring &length=value_len;
|
||||
sig_len : uint32;
|
||||
signature : bytestring &length=sig_len;
|
||||
pad : padding to (len - offsetof(first_byte_ext));
|
||||
first_byte_ext: uint8;
|
||||
field_type : uint8;
|
||||
len : uint16;
|
||||
association_id : uint16;
|
||||
timestamp : uint32;
|
||||
filestamp : uint32;
|
||||
value_len : uint32;
|
||||
value : bytestring &length=value_len;
|
||||
sig_len : uint32;
|
||||
signature : bytestring &length=sig_len;
|
||||
pad : padding to (len - offsetof(first_byte_ext));
|
||||
} &let {
|
||||
R: bool = (first_byte_ext & 0x80) > 0; # First bit of 8-bits value
|
||||
E: bool = (first_byte_ext & 0x40) > 0; # Second bit of 8-bits value
|
||||
Code: uint8 = (first_byte_ext & 0x3F); # Last 6 bits of 8-bits value
|
||||
R: bool = (first_byte_ext & 0x80) > 0; # First bit of 8-bits value
|
||||
E: bool = (first_byte_ext & 0x40) > 0; # Second bit of 8-bits value
|
||||
Code: uint8 = (first_byte_ext & 0x3F); # Last 6 bits of 8-bits value
|
||||
};
|
||||
|
||||
type NTP_Short_Time = record {
|
||||
seconds : int16;
|
||||
fractions : int16;
|
||||
seconds : int16;
|
||||
fractions : int16;
|
||||
};
|
||||
|
||||
type NTP_Time = record {
|
||||
seconds : uint32;
|
||||
fractions : uint32;
|
||||
seconds : uint32;
|
||||
fractions : uint32;
|
||||
};
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue