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Commit Graph

650 Commits (713bace44f05c4b900c35ad2da537ef5e0ad18ec)

Author SHA1 Message Date
Victor Julien 8b2886635f dcerpc/tcp: implement trunc logic 
When one side of the connection reaches the STREAM_DEPTH condition the
parser should be aware of this. Otherwise transactions will forever be
waiting for data in that direction.
 5 years ago
Victor Julien 4da0d9bdea applayer/rust: expose truncate callback 5 years ago
Shivani Bhardwaj 301454e9e4 dcerpc: fix datatypes while handling stub data 5 years ago
Shivani Bhardwaj 3fd9a3d420 dcerpc: fix datatype for stub data len 5 years ago
Philippe Antoine 222b386102 rust: rebuilds std when building fuzzers 
so as to have MSAN working
 5 years ago
Philippe Antoine 15447cc672 dceprc: signature rust check with is_char_boundary 
before calling split_at which would panic
 5 years ago
Philippe Antoine 6694737fcf http2: settings from http1 upgrade 5 years ago
Philippe Antoine 7011bddf84 http2: mimic HTTP1 request from upgrade 5 years ago
Philippe Antoine 9d1b030ff0 http2: first connection upgrade from http1 5 years ago
Philippe Antoine 547d6c2d78 applayer: pass parameter to StateAlloc 
This parameter is NULL or the pointer to the previous state
for the previous protocol in the case of a protocol change,
for instance from HTTP1 to HTTP2

This way, the new protocol can use the old protocol context.
For instance, HTTP2 mimicks the HTTP1 request, to have a HTTP2
transaction with both request and response
 5 years ago
Sascha Steinbiss ed9fed4958 mqtt: add some extra tests for varint parsing 5 years ago
Philippe Antoine 1a88df7e88 http2: handles incomplete frames after banner 
To signal incomplete data, we must return the number of
consumed bytes. When we get a banner and some records, we have
to take into account the number of bytes already consumed by
the banner parsing before reaching an incomplete record.
 5 years ago
Philippe Antoine 7ab9a01db2 mqtt: limit size of variable integer 5 years ago
Philippe Antoine e3b28bcf2a http2: returns error in case of index 0 
As is documented in RFC 7541, section 6.1
The index value of 0 is not used.  It MUST be treated as a decoding
error if found in an indexed header field representation.
 5 years ago
Jason Ish e9fec043b5 rust/util: expose function to test strings for valid UTF-8 
rs_check_utf8 will check that the provided string is valid
UTF-8 by converting it to a Rust string and returning true
or false.
 5 years ago
Simon Dugas 7f26246ce1 dns: parse and log fields for SOA record type 
Added `dns_parse_rdata_soa` to parse SOA fields into an `DNSRDataSOA`
struct.

Added logging for answer and authority SOA records in both version
1 & 2, as well as grouped formats.
 5 years ago
Simon Dugas af498fd840 dns: use nom's rest to take all remaining rdata 
Using nom's `rest` combinator eliminates the need to call the do_parse
macro for parsing a single element.
 5 years ago
Simon Dugas 8005f50647 dns: refactor to handle more rdata formats 
Represent rdata as `DNSRData` enum variants instead of `Vec<u8>`.
This will allow parsing/logging of more complex formats like SOA.
 5 years ago
Jason Ish 647e304f4b rust/log: minor cleanup 
Group functions for setting and getting the log level
together.
 5 years ago
Jason Ish ea1338b464 rust: function macro now returns the function name 
Borrow a macro from https://github.com/popzxc/stdext-rs that
will give us the Rust function name in SCLog messages in Rust.

As this trick only works on Rust 1.38 and newer, keep the old
macro around and set a feature based on a Rust version test
done during ./configure.
 5 years ago
Jason Ish bac8016d17 rust: plugin bootstrap function 
Functions written in Rust will need to suricata::plugin::init()
to bootstrap themselves. This bootstrap process sets the log level
within the Rust address space, and hooks up function pointers
that are expected to be set during normal runs of Suricata.
 5 years ago
Jason Ish 3de98b3595 rust/log: set the log level with a pure Rust function 
Make sure the log level is setup with a pure Rust function, so
when it is set, its set within the address space of the caller.

This is important for Rust plugins where the Rust modules are not
in the address space of the Suricata main process.
 5 years ago
Jason Ish ac93ab281d rust/logging: allow log macros to be used by plugins 
Fix plugin macros so they can be used by external Rust crates
such as plugins.
 5 years ago
Jason Ish 3672cea876 rust/Cargo: build as rlib for plugin linkage 
Build Rust code as an rlib, in addition to a staticlib so plugins
can link with the Rust code.
 5 years ago
Philippe Antoine b20a8de646 dns: simply skips zero-sized dns requests/responses 5 years ago
Ilya Bakhtin c903441fe7 mqtt: fixed wrong slice access 
Slice access esults in rust panic when mqtt ping is processed
 5 years ago
Victor Julien 4aa80ac7f6 detect/http2: fix header inspection 
Header inspection was overwriting data that was still being
referenced by the detect engine, leading to ASAN issues.
 5 years ago
Jason Ish f26d6eaf98 http2: log as http to abstract http and http2 a little 
This commit logs http2 as an http event. The idea is to somewhat
normalize http/http2 so common info can be version agnostic.

This puts the http2 specific fields in an "http2" object inside
the "http" object.

HTTP2 headers/values that are in common with HTTP1 are logged
under the "http" object to be compatible with HTTP1 logging.
 5 years ago
Jason Ish 6a55606adb http2: log headers in the same format as http (1) 
Log the headers in request_headers, and response_headers like
http1 to remain compatible.
 5 years ago
Philippe Antoine 1422b18a99 http2: initial support 5 years ago
Jeff Lucovsky be57f6d3cc rust/rdp: Fix use of incorrect buffer 
This commit updates the connection confirmation parsing function to use
the correct buffer when determining the packet type.
 5 years ago
Shivani Bhardwaj 2529eb35e1 smb: use uuid crate 5 years ago
Jason Ish e6668560e0 rust: only run cbindgen if needed 
Only run cbindgen when necessary. This is a bit tricky. When
building a dist we want to unconditionally build the headers.

When going through a "make; sudo make install" type process,
cbindgen should not be run as the headers already exist, are
valid, and the environment under sudo is more often than
not suitable to pick up the Rust toolchains when installed
with rustup.

For the normal "make" case we have the gen/rust-bindings.h file
depend on library file, this will cause it to only be rebuilt
if the code was modified.

For "make dist" we unconditionally create "dist/rust-bindings.h".
This means the generated file could be in 2 locations, so update
configure.ac, and the library search find to find it.

The "gen/rust-bindings.h" should be picked up first if it exists,
for those who develop from a dist archive where "dist/rust-bindings.h"
also exists.

Not completely happy having the same file in 2 locations, but not
sure how else to get the dependency tracking correct.
 5 years ago
Shivani Bhardwaj 4c7f55e636 dcerpc: handle gap for TCP streams 5 years ago
Jason Ish 6cff558663 dns: add tailing data to split tcp unit test 
Add trailing data to the complete payload to test the case
where data is consumed, but still incomplete.
 5 years ago
Jason Ish cc154ce152 dns: fix subtraction overflow in debug message 
The math for the return value wasn't updated in the debug log
to match the logic and could lead to a subtraction overflow
 5 years ago
Philippe Antoine 80ccbff28a dns: return status from parsing tcp request 5 years ago
Philippe Antoine 1296740471 dns: fix incomplete results 
and messages parsing whose length is >= 32768
 5 years ago
Philippe Antoine 83567e8732 files: rust closes files even on 0 length chunk 5 years ago
Sascha Steinbiss c31360070b rust/mqtt: add MQTT parser 5 years ago
Victor Julien b99ffd9ece eve: remove unused jansson code 5 years ago
Jeff Lucovsky 961b314b86 dns: Remove parser buffering code 5 years ago
Victor Julien 00cc3c7374 eve/ssh: change hassh logging format 
Elastic search didn't accept the 'hassh' and 'hassh.string'. It would
see the first 'hassh' as a string and split the second key into a
object 'hassh' with a string member 'string'. So two different types
for 'hassh', so it rejected it.

This patch mimics the ja3(s) logging by creating a 'hassh' object
with 2 members: 'hash', which holds the md5 representation, and
'string' which holds the string representation.
 5 years ago
Philippe Antoine eb5b927787 ssh: fixing incomplete kex parsing 
We use the record length from the ssh record header,
and not the size of the parsed data, as is done in other places.
 5 years ago
Victor Julien bcd416e6ba nfs: fix 'dangling' files in lossy sessions 
In case of lossy connections the NFS state would properly clean up
transactions, including file transactions. However for files the
state was never set to 'truncated', leading to files to stay 'active'.

This would lead these files staying in the NFS's state. In long running
sessions with lots of files this would lead to performance and memory
use issues.

This patch cleans truncates the file that was being transmitted when
a file transaction is being closed.

Based on 65e9a7c31c
 5 years ago
Victor Julien fc7cecb4ae nfs: check post-gap timeouts once a second at most 
Based on 25f2efe977
 5 years ago
Victor Julien 5d65e5a748 nfs: update ts only if it changed 
Based on 8aa380600d
 5 years ago
Zach Kelly b25de4d99a rdp: remove parser buffering code 5 years ago
Zach Kelly 22a2bee614 rdp/eve: convert to jsonbuilder 5 years ago
Zach Kelly ef397daba3 rdp: rustfmt (update) 5 years ago
Shivani Bhardwaj 35362b7bfa jsonbuilder: run test if not debug-validate 5 years ago
Shivani Bhardwaj 2ce7d98af1 dcerpc: fix tests to have a valid header 5 years ago
Shivani Bhardwaj 9f9670ebdc logging: Add DCERPC logger 5 years ago
Shivani Bhardwaj bab497ab2c dcerpc: Add multi transaction support 
DCERPC parser so far provided support for single transactions only.
Extend that to support multiple transactions.

In order for multiple transactions to work, there is always a
transaction identifier for any protocol in its header that lets a
response match the request. In DCERPC, for TCP, that param is call_id in
the header which is a 32 bit field. For UDP, however since it uses
different version of RPC (4.x), this is defined by serial number field
defined in the header. This field however is not contiguous and needs to
be assembled by the provided serial_low and serial_hi fields.
 5 years ago
Shivani Bhardwaj 67e7be633c krb: convert to jsonbuilder 
Closes redmine ticket 3754.
 5 years ago
Shivani Bhardwaj 72dab0a8b7 snmp: convert to jsonbuilder 
Closes redmine ticket 3756.
 5 years ago
Jason Ish 7ca24041b6 rust: add doc target to build rust docs 
Uses "cargo doc --no-deps" to build the documentation just for
our Suricata package. Without --no-deps, documentation will be
build for all our dependencies as well.

The generated documentation will end up in target/doc as HTML.
 5 years ago
Jason Ish abc71dc4a5 applayer template (rust): better gap handling example 
In the request parser, show checking if a gap was received
and what one example of trying to continue might look like.
 5 years ago
Jason Ish b91bb92b7d applayer template (rust): incomplete support 
Show how to use the incomplete AppLayerResult type within the
limits of what the template protocol parser can provide.

Redmine issue:
https://redmine.openinfosecfoundation.org/issues/3541
 5 years ago
Jason Ish 3f615f751b rust app-layer template: add stubs for gap handling 5 years ago
Jason Ish d60671d855 rust/dns: use new flags field to set parser option flags 5 years ago
Jason Ish 53aa967e0b applayer: add flags to parser registration struct 
This will allow Rust parsers to register for gap handing from
Rust (some Rust parsers do handle gaps, but they set the flag
from C).
 5 years ago
Jason Ish 9d9a901b68 dns: conditional logging 
Apply config to newly created response TX.
 5 years ago
Victor Julien ac3cf6ff75 detect/config: set config for special cases 
Allow app-layer to declare the txs are uni-directional and special
care is needed for applying config.
 5 years ago
Victor Julien 5dd4d948d9 app-layer: remove unused detect flags API 5 years ago
Victor Julien c94a5e6392 app-layer/rust: don't use option for GetTxDataFn anymore 5 years ago
Victor Julien 8fe9faecb2 app-layer: remove DetectFlags API. Replaced by AppLayerTxData 5 years ago
Victor Julien 88dd0abb38 rdp: support AppLayerTxData 5 years ago
Victor Julien 9664f73f75 app-layer: remove logged API calls 5 years ago
Victor Julien e0debed0b4 tftp: support AppLayerTxData 5 years ago
Victor Julien 4ff51a0e07 sip: support AppLayerTxData 5 years ago
Victor Julien cc1210c956 ntp: support AppLayerTxData 5 years ago
Victor Julien e0f75157a0 ikev2: support AppLayerTxData 5 years ago
Victor Julien 64e2a27512 applayer/template: support AppLayerTxData 5 years ago
Victor Julien a484bbbe1b dhcp: support AppLayerTxData 5 years ago
Victor Julien 11e2434526 snmp: support AppLayerTxData 5 years ago
Victor Julien 5afe4835ad rfb: support AppLayerTxData 5 years ago
Victor Julien 9f29366c7c krb5: support AppLayerTxData 5 years ago
Victor Julien 2aab1938d7 ssh: support AppLayerTxData 5 years ago
Victor Julien a1e06247a6 dcerpc/udp: support AppLayerTxData 5 years ago
Victor Julien 3202d29325 dcerpc: support AppLayerTxData 5 years ago
Victor Julien 77a95eddd9 smb: support AppLayerTxData 5 years ago
Victor Julien 7a7805cde6 nfs: support AppLayerTxData 5 years ago
Victor Julien fb3bdd8cf3 dns: remove detect_flags and logged now that we use AppLayerTxData 5 years ago
Victor Julien 5665fc8301 app-layer: add ApplyTxConfig API 
Optional callback a parser can register for applying configuration
to the 'transaction'. Most parsers have a bidirectional tx. For those
parsers that have different types of transaction handling, this new
callback can be used to properly apply the config.
 5 years ago
Victor Julien e15995e2d2 detect: store detect flags in AppLayerTxData 5 years ago
Victor Julien c797c9f09c app-layer: add logger flags to AppLayerTxData 5 years ago
Victor Julien 411f428a38 app-layer: define AppLayerTxData and AppLayerTxConfig 
AppLayerTxData is a structure each tx should include that will contain
the common fields the engine needs for tracking logging, detection and
possibly other things.

AppLayerTxConfig will be used by the detection engine to configure
the transaction.
 5 years ago
Jason Ish 03efbccfe6 jsonbuilder: set_float, append_float methods 
New methods for setting and appending float values.
 5 years ago
Philippe Antoine ece29c4210 ssh: fix incomplete return for ssh kex 
In the case where we already parsed some records
 5 years ago
Philippe Antoine ca6d072297 dcerpc: detect right parsing of empty op version 5 years ago
Emmanuel Thompson 6e5d64f102 detect/asn1: Simplify errors and checks 5 years ago
Emmanuel Thompson 4fc45b5c60 detect/asn1: Update ASN1 struct lifetime 
- 'static is only realistic when allocating and leaking it over the
FFI boundary
 5 years ago
Emmanuel Thompson 627e90a4bd detect/asn1: Log out errors 
- Failure to parse asn1-max-frames
- Failure on asn1 detection checks
 5 years ago
Emmanuel Thompson 88601b1993 detect/asn1: Update relative_offset keyword 
- To be consistent with recent C version changes
- Add checks for over/underflows
 5 years ago
Emmanuel Thompson 7af6cdb7ec detect/asn1: Update asn1 C files to use rust code 
Mark rust extern "C" functions as pub in asn1 module to expose via cbindgen
Update detect-asn1.c/h to use rust functions
 5 years ago
Emmanuel Thompson 63704fdf13 rust/asn1: Introduce ASN1 rust module 
This module uses the `der-parser` crate to parse ASN1 objects in order to replace src/util-decode-asn1.c
It also handles the parsing of the asn1 keyword rules and detection checks performed in src/detect-asn1.c
 5 years ago
Emmanuel Thompson 6b8517dc12 rust: Update der, kerberos and snmp parser dependencies 
- The update to der-parser allows us to use the latest API changes
 5 years ago
Jason Ish 43b9bfaed4 applayer template (rust): convert to JsonBuilder 5 years ago
Vadym Malakhatko 126597144c eve: add Hassh fields to SSH JSON logger and add ssh log condition 5 years ago
Vadym Malakhatko 536cee3ba9 rust/ssh: add hassh generation 
Add generation of hassh fingerprints based on fields in the kexinit record
 5 years ago
Jeff Lucovsky d5bb41011c output/ikev2: Convert to JsonBuilder 
Convert the IKEV2 Json logging to use JsonBuilder.
 5 years ago
Victor Julien 65e9a7c31c smb: fix 'dangling' files in lossy sessions 
In case of lossy connections the SMB state would properly clean up
transactions, including file transactions. However for files the
state was never set to 'truncated', leading to files to stay 'active'.

This would lead these files staying in the SMB's state. In long running
sessions with lots of files this would lead to performance and memory
use issues.

This patch cleans truncates the file that was being transmitted when
a file transaction is being closed.
 5 years ago
Victor Julien 25f2efe977 smb: check post-gap timeouts once a second at most 5 years ago
Victor Julien 8aa380600d smb: update ts only if it changed 5 years ago
Jeff Lucovsky 8c5c949cfa output/tftp: Convert to JsonBuilder 
This commit converts the TFTP logging mechanisms to JsonBuilder.
 5 years ago
Jason Ish 07e88a7479 jsonbuilder: add debug_validate to state 
If debug validation is enabled, panic on invalid state errors.

For example, calling close on an already closed jsonbuilder
object.
 5 years ago
Jason Ish ca6b70ea1b rust: macro debug_validate_fail to fail with message 
Add a new debug_validate macro that unconditionally panics
with a message. Useful in Rust pattern matching.
 5 years ago
Shivani Bhardwaj a7535099b4 smb/eve: convert to jsonbuilder 
Closes redmine ticket 3712.
 5 years ago
Jason Ish 639f3d265e rust: lock to nom 5.1.1 
5.1.2 pulls in dependencies that don't build on Rust 1.34.
 5 years ago
Victor Julien 79681bf655 app-layer: remove old MPMId API calls 
Had been deprecated and non-functional since 2017.
 5 years ago
Jason Ish a545cdef6a jsonbuilder: setter for formatted data 
Create a method to set preformatted data that contains the key
and the value already formatted.

This is an optimization for static data.
 5 years ago
Jason Ish e3b7c58218 jsonbuilder: export {set,append}_string_from_bytes to C 5 years ago
Jason Ish f184bcc10e jsonbuilder: use Box::from_raw instead of transmute to free 
I think this is a bad use of transmute, while the end result
is the same, Box::from_raw is more correct as we created this
pointer with Box::into_raw.
 5 years ago
Philippe Antoine baf5f52f22 ssh/eve: convert to jsonbuilder 5 years ago
Victor Julien b3b5802c85 eve/nfs: switch output to jsonbuilder 5 years ago
Jason Ish 6ce9b2972b rdp: enable by default 
Redmine issue:
https://redmine.openinfosecfoundation.org/issues/3255
 5 years ago
Jason Ish 5a7ba62493 sip: enable by default 
Redmine issue:
https://redmine.openinfosecfoundation.org/issues/3256
 5 years ago
Jason Ish 36d687580a rfb/eve: convert to jsonbuilder 5 years ago
Jason Ish 60bfbd43fd jsonbuilder: add reset marks 
Add methods to get the state of a JsonBuilder (called a mark),
then allow restoring to the mark.
 5 years ago
Jason Ish ddb22549be rust: allow some clippy lints without warning 
Suppresses some clippy lints that have more to do with style
than anything else, to reduce the amount of noise in the
clippy output.
 5 years ago
Jason Ish 03cf3dcd6d dns/eve: convert to jsonbuilder 5 years ago
Jason Ish 6a70d6bb6e sip/eve: convert to jsonbuilder 5 years ago
Jason Ish deed0541bb dhcp/eve: convert to jsonbuilder 5 years ago
Jason Ish 942dd08654 jsonbuilder: new module for generating json 
JsonBuilder is a Rust module for creating JSON output. Unlike
Jansson, the final JSON string is built up as items are added,
instead of building up an object tree and rendering it when
done.

The idea is to create a more efficient JSON serializer instead
of a flexible one.
 5 years ago
Jason Ish c1f4edc434 rust: bring back libc as a dependency 
Its already pulled in by some of other dependencies so adds zero
extra weight, and provides handy definitions for basic functions
like free().
 5 years ago
Jason Ish 5513b4ed0b rust/json: expose libjansson json_dumps 
This will be temporarily used by JsonBuilder to add the ability
to extend JsonBuilder with Jansson's json_t types.
 5 years ago
Victor Julien 9fd326b6c0 ssh: minor cleanups in incomplete handling 5 years ago
Victor Julien 3a2434ed4d app-layer: support Copy and Clone traits in AppLayerResult 5 years ago
Victor Julien b0288da686 app-layer: add methods to get status from AppLayerResult 5 years ago
Philippe Antoine 6373071aa3 ssh: handles incomplete record after banner 
To signal incomplete data, we must return the number of
consumed bytes. When we get a banner and some records, we have
to take into account the number of bytes already consumed by
the banner parsing before reaching an incomplete record.
 5 years ago
Philippe Antoine 69b4fffdae parse: move SSH parser from C to Rust 6 years ago
Philippe Antoine cb3c478525 style: compressed function headers for rustfmt 6 years ago
Philippe Antoine 6b2e7dde7d rust: export enums definition to C 6 years ago
Shivani Bhardwaj 80adf7d1cf smb: Import constants from DCERPC 
Remove DCERPC constants to avoid duplicate name errors. Import the
required constants from DCERPC implementation.
 6 years ago
Shivani Bhardwaj 6457754fd6 dcerpc: Replace C function calls with Rust 
All the dead code in C after the Rust implementation is hereby removed.
Invalid/migrated tests have also been deleted.
All the function calls in C have been replaced with appropriate calls to
Rust functions. Same has been done for smb/detect.rs as a part of this
migration.
 6 years ago
Shivani Bhardwaj 8036202c7b rust: Add DCERPC parser 
This parser rewrites the DCE/RPC protocol implementation of Suricata
in Rust. More tests have been added to improve the coverage and some
fixes have been made to the tests already written in C. Most of the
valid tests from C have been imported to Rust.

File anatomy

src/dcerpc.rs
This file contains the implementation of single transactions in DCE/RPC
over TCP. It takes care of REQUEST, RESPONSE, BIND and BINDACK business
logic before and after the data parsing. DCERPCState holds the state
corresponding to a particular transaction and handles all important
aspects. It also defines any common structures and constants required
for DCE/RPC parsing irrespective of the carrier protocol.

src/dcerpc_udp.rs
This file contains the implementation of single transactions in DCE/RPC
over UDP. It takes care of REQUEST and RESPONSE parsing. It borrows the
Request and Response structs from src/dcerpc.rs.

src/detect.rs
This file contains the implementation of dce_iface and opnum detect
keywords. Both the parsing and the matching is taken care of by
functions in this file. Tests have been rewritten with the test data
from C.

src/parser.rs
This file contains all the nom parsers written for DCERPCRequest,
DCERPCResponse, DCERPCBind, DCERPCBindAck, DCERPCHeader, DCERPCHdrUdp.
It also implements functions to assemble and convert UUIDs. All the
fields have their endianness defined unless its an 8bit field or an
unusable one, then it's little endian but it won't make any difference.

src/mod.rs
This file contains all the modules of dcerpc folder which should be
taken into account during compilation.

Function calls

This is a State-wise implementation of the protocol for single
transaction only i.e. a valid state object is required to parse any
record. Function calls start with the app layer parser in C which
detects the application layer protocol to be DCE/RPC and calls the
appropriate functions in C which in turn make a call to these functions
in Rust using FFI. All the necessary information is passed from C to the
parsers and handlers in Rust.

Implementation

When a batch of input comes in, there is an analysis of whether the
input header and the direction is appropriate. Next check is about the
size of fragment. If it is as defined by the header, process goes
through else the data is buffered and more data is awaited. After this,
type of record as indicated by the header is checked. A call to the
appropriate handler is made. After the handling, State is updated with
the latest information about whatever record came in.
AppLayerResult::ok() is returned in case all went well else
AppLayerResult::err() is returned indicating something went wrong.
 6 years ago
Shivani Bhardwaj 6db1f19d62 rust: Add debug_validate_bug_on macro 
This macro allows to check if certain parts of the code are reachable
during fuzzing.
 6 years ago
Shivani Bhardwaj 57ad609a97 rust: Add new crate uuid 6 years ago
Shivani Bhardwaj ab6b4986ce rust: Add Debug and PartialEq to AppLayerResult 6 years ago
frank honza bbe9137f20 rfb: Update incomplete handling in parser. 
This commit adds an updated incomplete handling for the RFB-Parser. If
incomplete data is processed, the successfully consumed position and
length of remainder + 1 is returned. If the next packet is not empty
suricata will call the parser again.

This commit is a result of discussion on https://github.com/OISF/suricata/pull/4792.
 6 years ago
Philippe Antoine edcb784f1a dns: improve probe_tcp handling of incomplete data 6 years ago
Sascha Steinbiss 713c379427 rfb: make sure size calculations do not overflow 
Addresses #3570 by extra checking of calculated size requests.

With the given input, the parser eventually arrived at
parser::parse_failure_reason() which parsed from the remaining four
bytes (describing the string length) that the failure string to follow
would be 4294967295 bytes long. While calculating the total size of the
data to request via AppLayerResult::incomplete(), adding the four bytes
for the parsed but not consumed string length caused the u32 length to
overflow, resulting in a much smaller value triggering the bug condition.

This problem was addressed by more careful checking of values in each step
that could overflow: one subtraction, one addition (which could overflow
the usize length values), and a final check to determine whether the result
still fit into the u32 values required by AppLayerResult::incomplete().
If so, we would safely convert the values and pass them to the result type.
If not, we simply return AppLayerResult::err() but do not erroneously and
silently request the wrong amount.
 6 years ago
Pierre Chifflier 01aef49cbd rust/x509: map decoding errors to decoder events 6 years ago
Pierre Chifflier 36d2e257c6 rust/x509: use the raw serial number so leading zeros are not removed 6 years ago
Pierre Chifflier d92321d8b1 ssl/tls: use the rust decoder to decode X.509 certificates 6 years ago
Pierre Chifflier 10d9deec9f rust: add common function to exchange CString objects from/to C 6 years ago
Sascha Steinbiss 26123e05f2 rfb: use more idiomatic Rust code 
Using 'if let Some()...' makes the code in these many checks more
concise and readable.
 6 years ago
Frank Honza 1c8943dedd add RFB parser 
This commit adds support for the Remote Framebuffer Protocol (RFB) as
used, for example, by various VNC implementations. It targets the
official versions 3.3, 3.7 and 3.8 of the protocol and provides logging
for the RFB handshake communication for now. Logged events include
endpoint versions, details of the security (i.e. authentication)
exchange as well as metadata about the image transfer parameters.
Detection is enabled using keywords for:

 - rfb.name: Session name as sticky buffer
 - rfb.sectype: Security type, e.g. VNC-style challenge-response
 - rfb.secresult: Result of the security exchange, e.g. OK, FAIL, ...

The latter could be used, for example, to detect brute-force attempts
on open VNC servers, while the name could be used to map unwanted VNC
sessions to the desktop owners or machines.

We also ship example EVE-JSON output and keyword docs as part of the
Sphinx source for Suricata's RTD documentation.
 6 years ago
Victor Julien acef21b759 app-layer: extend AppLayerResult to add convenience 6 years ago