In some rare cases, it is possible to sub-classify the flow via ALPN
matching. This is particularly usefull for asymmetric traffic where the
Client Hello doens't have the SNI.
For the time being there is only one rule, about ANYDESK.
TLS classification usually stops after processing *server* certificates
(if any). That means, that *client* certificate, if present, is usually
ignored.
However in some corner cases (i.e. unidirectional traffic) we might end
up processing client certificate and exposing its metadata: the issue is
that the application will think that this metadata are about the server
and not about the client.
So, for the time being, always ignore client certificate processing.
As a future work, we might find an efficient way to process and export both
certificates.
This is likely a false positive, triggered by the fact that libpcre is
usually compiled without MASAN support.
It it was a real error, ASAN would complain loudly with a invalid-free
error at the end of the same function.
```
==83793==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0x562296111174 in ndpi_compile_rce_regex /home/ivan/svnrepos/nDPI/src/lib/ndpi_utils.c:1631:3
#1 0x5622960e3e4a in ndpi_is_rce_injection /home/ivan/svnrepos/nDPI/src/lib/ndpi_utils.c:1636:5
#2 0x5622960de7cd in ndpi_validate_url /home/ivan/svnrepos/nDPI/src/lib/ndpi_utils.c:1741:12
#3 0x5622960dae45 in ndpi_dpi2json /home/ivan/svnrepos/nDPI/src/lib/ndpi_utils.c:1362:29
#4 0x5622960e2751 in ndpi_flow2json /home/ivan/svnrepos/nDPI/src/lib/ndpi_utils.c:1512:10
#5 0x562296033b0f in process_ndpi_collected_info /home/ivan/svnrepos/nDPI/example/reader_util.c:1310:9
#6 0x5622960501f9 in packet_processing /home/ivan/svnrepos/nDPI/example/reader_util.c:1659:2
#7 0x562296045aef in ndpi_workflow_process_packet /home/ivan/svnrepos/nDPI/example/reader_util.c:2202:10
#8 0x562295e85374 in ndpi_process_packet /home/ivan/svnrepos/nDPI/example/ndpiReader.c:3937:7
#9 0x7f1235053466 (/lib/x86_64-linux-gnu/libpcap.so.0.8+0x23466) (BuildId: b84c893ea2516d6fb2c1c6726b1fe93b3be78f61)
#10 0x7f1235041f67 in pcap_loop (/lib/x86_64-linux-gnu/libpcap.so.0.8+0x11f67) (BuildId: b84c893ea2516d6fb2c1c6726b1fe93b3be78f61)
#11 0x562295e53139 in runPcapLoop /home/ivan/svnrepos/nDPI/example/ndpiReader.c:4060:15
#12 0x562295e51e7f in processing_thread /home/ivan/svnrepos/nDPI/example/ndpiReader.c:4130:3
#13 0x7f1234e53608 in start_thread /build/glibc-SzIz7B/glibc-2.31/nptl/pthread_create.c:477:8
#14 0x7f1234d2f132 in __clone /build/glibc-SzIz7B/glibc-2.31/misc/../sysdeps/unix/sysv/linux/x86_64/clone.S:95
Uninitialized value was created by an allocation of 'pcreErrorStr' in the stack frame
#0 0x5622961108a6 in ndpi_compile_rce_regex /home/ivan/svnrepos/nDPI/src/lib/ndpi_utils.c:1603:3
```
```
==24879==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7fa085b31e60 at pc 0x55cc63f203e2 bp 0x7ffc9ec91b10 sp 0x7ffc9ec91298
READ of size 17 at 0x7fa085b31e60 thread T0
#0 0x55cc63f203e1 in printf_common(void*, char const*, __va_list_tag*) asan_interceptors.cpp.o
#1 0x55cc63f20769 in vsnprintf (/home/ivan/svnrepos/nDPI/fuzz/fuzz_process_packet_with_main+0x50e769) (BuildId: cce2b6b1344bfd0bdc9626fef604c2b3caad485b)
#2 0x55cc63f22210 in __interceptor_snprintf (/home/ivan/svnrepos/nDPI/fuzz/fuzz_process_packet_with_main+0x510210) (BuildId: cce2b6b1344bfd0bdc9626fef604c2b3caad485b)
#3 0x55cc6420fc76 in ndpi_check_http_server /home/ivan/svnrepos/nDPI/src/lib/protocols/http.c:668:4
#4 0x55cc6420344b in check_content_type_and_change_protocol /home/ivan/svnrepos/nDPI/src/lib/protocols/http.c:742:5
#5 0x55cc642031ce in check_content_type_and_change_protocol /home/ivan/svnrepos/nDPI/src/lib/protocols/http.c:737:7
#6 0x55cc641fac9f in ndpi_check_http_tcp /home/ivan/svnrepos/nDPI/src/lib/protocols/http.c:1352:4
#7 0x55cc641f2fd5 in ndpi_search_http_tcp /home/ivan/svnrepos/nDPI/src/lib/protocols/http.c:1461:3
#8 0x55cc64085275 in check_ndpi_detection_func /home/ivan/svnrepos/nDPI/src/lib/ndpi_main.c:5580:6
#9 0x55cc64085c87 in check_ndpi_tcp_flow_func /home/ivan/svnrepos/nDPI/src/lib/ndpi_main.c:5628:12
#10 0x55cc64085927 in ndpi_check_flow_func /home/ivan/svnrepos/nDPI/src/lib/ndpi_main.c:5647:12
#11 0x55cc64095fcb in ndpi_detection_process_packet /home/ivan/svnrepos/nDPI/src/lib/ndpi_main.c:6458:15
#12 0x55cc63fd08b4 in LLVMFuzzerTestOneInput /home/ivan/svnrepos/nDPI/fuzz/fuzz_process_packet.c:29:5
#13 0x55cc63fd09f7 in main /home/ivan/svnrepos/nDPI/fuzz/fuzz_process_packet.c:101:17
#14 0x7fa0880fb082 in __libc_start_main /build/glibc-SzIz7B/glibc-2.31/csu/../csu/libc-start.c:308:16
#15 0x55cc63efb45d in _start (/home/ivan/svnrepos/nDPI/fuzz/fuzz_process_packet_with_main+0x4e945d) (BuildId: cce2b6b1344bfd0bdc9626fef604c2b3caad485b)
Address 0x7fa085b31e60 is located in stack of thread T0 at offset 96 in frame
#0 0x55cc6420f1bf in ndpi_check_http_server /home/ivan/svnrepos/nDPI/src/lib/protocols/http.c:644
This frame has 5 object(s):
[32, 36) 'a' (line 653)
[48, 52) 'b' (line 653)
[64, 68) 'c' (line 653)
[80, 96) 'buf' (line 654)
[112, 176) 'msg' (line 662) <== Memory access at offset 96 partially underflows this variable
```
Found by oss-fuzzer
See: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=52229
These flows are classifed as `LINE_CALL`; another option was
`RTP/LINE_CALL`. No sure about the best solution...
Extend LINE domains list.
Remove RTP dead code.
* implicit conversion to an 32 bit unsigned int leads to an overflow
Signed-off-by: Toni Uhlig <matzeton@googlemail.com>
Signed-off-by: Toni Uhlig <matzeton@googlemail.com>
* NDPI_CONFIDENCE_MAX is useless otherwise since it is
supposed the be the highest value w/o any gaps
* for client applications, it makes sense to use that
the numbers directly w/o any additional mapping
Signed-off-by: Toni Uhlig <matzeton@googlemail.com>
Signed-off-by: Toni Uhlig <matzeton@googlemail.com>
* Standard support for LINE app
* Added test pcap for LINE app
* make check result for LINE app
* Make check success as 1kxun has LINE packets
* Added the ASN inc file for LINE
* Removed extra lines as its effecting make check
* Editing the SNI required a new pcap output file for TLS.Line format
* Run Configure with --with-pcre --with-maxminddb to enable the generation of h323-overflow.pcap.out
Co-authored-by: Sharon Enoch <sharone@amzetta.com>
Note that current code access `certificate_processed` state even before
setting the protocol classification, so this piece of information can't
be saved in `flow->protos` union.
LRU callbacks have been added in 460ff3c7a, but they have never been
used and they have never been extended to the other LRU caches.
`ndpi_search_tcp_or_udp()` basically returns the classification by port/ip
of the flow; calling it from the dissector is useless.
The same for TOR detection: ips are checked in the generic code
0 as size value disable the cache.
The diffs in unit tests are due to the fact that some lookups are
performed before the first insert: before this change these lookups
weren't counted because the cache was not yet initialized, now they are.
