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fix: porting the code to ubuntu 24.04 with llvm 18 and libssl 3.0 #55

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fix: porting the code to ubuntu 24.04 with llvm 18 and libssl 3.0 #55

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01481dd
fix: porting the code to ubuntu 24.04 with llvm 18 and libssl 3.0
May 15, 2025
4c7e9f2
Change the demo connection
entlein May 16, 2025
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2 changes: 1 addition & 1 deletion openssl-tracer/Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -15,7 +15,7 @@
# SPDX-License-Identifier: Apache-2.0

openssl_tracer: openssl_tracer.cc probe_deployment.cc
clang++ --std=c++17 -o $@ $^ -lbcc
clang++ --std=c++17 -o $@ $^ -lbcc -I /usr/lib/llvm-18 -I/usr/include/llvm-18

clean:
rm openssl_tracer
30 changes: 11 additions & 19 deletions openssl-tracer/README.md
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Expand Up @@ -9,7 +9,7 @@ This demo was created to accompany the "Debugging with eBPF Part 3: Tracing SSL/
You must have the BCC development package installed. On Ubuntu, the package can be installed as follows:

```
sudo apt install libbpfcc-dev
sudo apt install libbpfcc-dev binutils clang llvm bcc python3 openssl -y
```

Other distributions have similar commands.
Expand All @@ -29,34 +29,26 @@ A demo application to trace is included. It is a simple client-server written in
First, you'll have to generate some certificates for the client and server.
To keep things simple, you can generate some self-signed certificates as follows:

```
make -C ssl_client_server certs
```

To run the demo app, you'll need two terminals.
To run the demo, you'll need two terminals.

In one terminal, run the server:
In one terminal, open a secure connection to e.g. google

```
cd ssl_client_server; ./server.py
openssl s_client -connect google.com:443
```

In the second terminal, run the client:
In the second terminal, run the tracer on the ProcessID (pid) of the above connection

```
cd ssl_client_server; ./client.py
sudo ./openssl_tracer $(pgrep -f openssl)
```

## Run Tracer

The BPF tracer is run as follows:

Now, back in the openssl terminal
```
sudo ./openssl_tracer <pid>
GET / HTTP/1.1
and press enter twice
```

To run it on the demo app, run the following command in a separate terminal:

```
sudo ./openssl_tracer $(pgrep -f "./client.py")
```


9 changes: 5 additions & 4 deletions openssl-tracer/openssl_tracer.cc
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Expand Up @@ -22,37 +22,38 @@
#include <iostream>
#include <streambuf>
#include <string>
#include <stdint.h>

#include "openssl_tracer_types.h"
#include "probe_deployment.h"

// A probe on entry of SSL_write
UProbeSpec kSSLWriteEntryProbeSpec{
.obj_path = "/usr/lib/x86_64-linux-gnu/libssl.so.1.1",
.obj_path = "/usr/lib/x86_64-linux-gnu/libssl.so.3",
.symbol = "SSL_write",
.attach_type = BPF_PROBE_ENTRY,
.probe_fn = "probe_entry_SSL_write",
};

// A probe on return of SSL_write
UProbeSpec kSSLWriteRetProbeSpec{
.obj_path = "/usr/lib/x86_64-linux-gnu/libssl.so.1.1",
.obj_path = "/usr/lib/x86_64-linux-gnu/libssl.so.3",
.symbol = "SSL_write",
.attach_type = BPF_PROBE_RETURN,
.probe_fn = "probe_ret_SSL_write",
};

// A probe on entry of SSL_read
UProbeSpec kSSLReadEntryProbeSpec{
.obj_path = "/usr/lib/x86_64-linux-gnu/libssl.so.1.1",
.obj_path = "/usr/lib/x86_64-linux-gnu/libssl.so.3",
.symbol = "SSL_read",
.attach_type = BPF_PROBE_ENTRY,
.probe_fn = "probe_entry_SSL_read",
};

// A probe on return of SSL_read
UProbeSpec kSSLReadRetProbeSpec{
.obj_path = "/usr/lib/x86_64-linux-gnu/libssl.so.1.1",
.obj_path = "/usr/lib/x86_64-linux-gnu/libssl.so.3",
.symbol = "SSL_read",
.attach_type = BPF_PROBE_RETURN,
.probe_fn = "probe_ret_SSL_read",
Expand Down