ecapture

Project Url: gojue/ecapture
Introduction: capture SSL/TLS text content without CA cert using eBPF. supports Linux/Android x86_64/Aarch64.
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eCapture(旁观者): capture SSL/TLS text content without CA cert Using eBPF.

Note

Supports Linux/Android kernel versions x86_64 4.18 and above, aarch64 5.5 and above.

Does not support Windows and macOS system.

How eCapture works

  • SSL/TLS text context capture, support openssl\libressl\boringssl\gnutls\nspr(nss) libraries.
  • bash audit, capture bash command for Host Security Audit.
  • mysql query SQL audit, support mysqld 5.6\5.7\8.0, and mariadDB.

eCapture Architecture

eCapture User Manual

eCapture User Manual

Getting started

use ELF binary file

Download ELF zip file release , unzip and use by command ./ecapture --help.

Command line options

Note

Need ROOT permission.

eCapture search /etc/ld.so.conf file default, to search load directories of SO file, and search openssl shard libraries location. or you can use --libssl flag to set shard library path.

If target program is compile statically, you can set program path as --libssl flag value directly。

Pcapng result

./ecapture tls -i eth0 -w pcapng -p 443 capture plaintext packets save as pcapng file, use Wireshark read it directly.

plaintext result

./ecapture tls will capture all plaintext context ,output to console, and capture Master Secret of openssl TLS save to ecapture_master.log. You can also use tcpdump to capture raw packet,and use Wireshark to read them with Master Secret settings.

>

check your server BTF config:

cfc4n@vm-server:~$# uname -r
4.18.0-305.3.1.el8.x86_64
cfc4n@vm-server:~$# cat /boot/config-`uname -r` | grep CONFIG_DEBUG_INFO_BTF
CONFIG_DEBUG_INFO_BTF=y

tls command

capture tls text context. Step 1:

./ecapture tls --hex

Step 2:

curl https://github.com

libressl&boringssl

# for installed libressl, libssl.so.52 is the dynamic ssl lib
vm@vm-server:~$ ldd /usr/local/bin/openssl
    linux-vdso.so.1 (0x00007ffc82985000)
    libssl.so.52 => /usr/local/lib/libssl.so.52 (0x00007f1730f9f000)
    libcrypto.so.49 => /usr/local/lib/libcrypto.so.49 (0x00007f1730d8a000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f1730b62000)
    /lib64/ld-linux-x86-64.so.2 (0x00007f17310b2000)

# use the libssl to config the libssl.so path
vm@vm-server:~$ sudo ./ecapture tls --libssl="/usr/local/lib/libssl.so.52" --hex

# in another terminal, use the command, then type some string, watch the output of ecapture
vm@vm-server:~$ /usr/local/bin/openssl s_client -connect github.com:443

# for installed boringssl, usage is the same
/path/to/bin/bssl s_client -connect github.com:443

bash command

capture bash command.

ps -ef | grep foo

What's eBPF

eBPF

uprobe HOOK

openssl\libressl\boringssl hook

eCapture hookSSL_write \ SSL_read function of shared library /lib/x86_64-linux-gnu/libssl.so.1.1. get text context, and send message to user space by eBPF maps.

Probes: []*manager.Probe{
    {
        Section:          "uprobe/SSL_write",
        EbpfFuncName:     "probe_entry_SSL_write",
        AttachToFuncName: "SSL_write",
        //UprobeOffset:     0x386B0,
        BinaryPath: "/lib/x86_64-linux-gnu/libssl.so.1.1",
    },
    {
        Section:          "uretprobe/SSL_write",
        EbpfFuncName:     "probe_ret_SSL_write",
        AttachToFuncName: "SSL_write",
        //UprobeOffset:     0x386B0,
        BinaryPath: "/lib/x86_64-linux-gnu/libssl.so.1.1",
    },
    {
        Section:          "uprobe/SSL_read",
        EbpfFuncName:     "probe_entry_SSL_read",
        AttachToFuncName: "SSL_read",
        //UprobeOffset:     0x38380,
        BinaryPath: "/lib/x86_64-linux-gnu/libssl.so.1.1",
    },
    {
        Section:          "uretprobe/SSL_read",
        EbpfFuncName:     "probe_ret_SSL_read",
        AttachToFuncName: "SSL_read",
        //UprobeOffset:     0x38380,
        BinaryPath: "/lib/x86_64-linux-gnu/libssl.so.1.1",
    },
    /**/
},

bash readline.so hook

hook /bin/bash symbol name readline.

How to compile

Linux Kernel: >= 4.18.

Tools

  • golang 1.18
  • clang 9.0
  • cmake 3.18.4
  • clang backend: llvm 9.0
  • kernel config:CONFIG_DEBUG_INFO_BTF=y (Optional, 2022-04-17)

command

sudo apt-get update
sudo apt-get install --yes build-essential pkgconf libelf-dev llvm-9 clang-9 linux-tools-common linux-tools-generic
for tool in "clang" "llc" "llvm-strip"
do
  sudo rm -f /usr/bin/$tool
  sudo ln -s /usr/bin/$tool-9 /usr/bin/$tool
done
git clone git@github.com:gojue/ecapture.git
cd ecapture
make
bin/ecapture --help

compile without BTF

eCapture support BTF disabled with command make nocore to compile on 2022/04/17.

make nocore
bin/ecapture --help

Contributing

See CONTRIBUTING for details on submitting patches and the contribution workflow.

Contributors


CFC4N

🚇 ⚠️ 💻

Hengqi Chen

🚇 ⚠️ 💻

chriskali

💻

huzai9527

💻

Vincent Li

💻

yihong

💻

Blaise Wang

💻

4ft35t

💻

weishu

💻

cui fliter

💻

Patryk Krawaczyński

💻

yindex

💻

Wenhao Jiang

💻
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