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141 lines
6.1 KiB
Markdown
141 lines
6.1 KiB
Markdown
# Pentesting gRPC-Web
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{{#include ../banners/hacktricks-training.md}}
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## **Manipulation des charges utiles gRPC-Web**
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gRPC-Web utilise Content-Type: `application/grpc-web-text` dans les requêtes, qui est une sorte de protobuf sous forme encodée en base64. Vous pouvez utiliser l'outil [gprc-coder](https://github.com/nxenon/grpc-pentest-suite) et vous pouvez également installer son [Burp Suite Extension](https://github.com/nxenon/grpc-pentest-suite).
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### **Manuel avec l'outil gGRPC Coder**
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1. Tout d'abord, décodez la charge utile :
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```bash
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echo "AAAAABYSC0FtaW4gTmFzaXJpGDY6BVhlbm9u" | python3 grpc-coder.py --decode --type grpc-web-text | protoscope > out.txt
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```
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2. Modifier le contenu de la charge utile décodée
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```
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nano out.txt
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2: {"Amin Nasiri Xenon GRPC"}
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3: 54
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7: {"<script>alert(origin)</script>"}
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```
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3. Encoder le nouveau payload
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```bash
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protoscope -s out.txt | python3 grpc-coder.py --encode --type grpc-web-text
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```
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4. Utilisez la sortie dans l'intercepteur Burp :
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```
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AAAAADoSFkFtaW4gTmFzaXJpIFhlbm9uIEdSUEMYNjoePHNjcmlwdD5hbGVydChvcmlnaW4pPC9zY3JpcHQ+
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```
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### **Manuel avec l'extension gRPC-Web Coder Burp Suite**
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Vous pouvez utiliser l'extension gRPC-Web Coder Burp Suite dans [gRPC-Web Pentest Suite](https://github.com/nxenon/grpc-pentest-suite) qui est plus facile. Vous pouvez lire les instructions d'installation et d'utilisation dans son dépôt.
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## **Analyse des fichiers Javascript gRPC-Web**
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Il y a au moins un fichier Javascript dans chaque application gRPC-Web. Vous pouvez analyser le fichier pour trouver de nouveaux messages, points de terminaison et services. Essayez d'utiliser l'outil [gRPC-Scan](https://github.com/nxenon/grpc-pentest-suite).
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1. Téléchargez le fichier Javascript gRPC-Web
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2. Scannez-le avec grpc-scan.py :
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```bash
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python3 grpc-scan.py --file main.js
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```
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3. Analysez la sortie et testez les nouveaux points de terminaison et les nouveaux services :
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```
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Output:
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Found Endpoints:
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/grpc.gateway.testing.EchoService/Echo
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/grpc.gateway.testing.EchoService/EchoAbort
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/grpc.gateway.testing.EchoService/NoOp
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/grpc.gateway.testing.EchoService/ServerStreamingEcho
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/grpc.gateway.testing.EchoService/ServerStreamingEchoAbort
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Found Messages:
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grpc.gateway.testing.EchoRequest:
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+------------+--------------------+--------------+
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| Field Name | Field Type | Field Number |
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+============+====================+==============+
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| Message | Proto3StringField | 1 |
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+------------+--------------------+--------------+
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| Name | Proto3StringField | 2 |
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+------------+--------------------+--------------+
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| Age | Proto3IntField | 3 |
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+------------+--------------------+--------------+
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| IsAdmin | Proto3BooleanField | 4 |
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+------------+--------------------+--------------+
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| Weight | Proto3FloatField | 5 |
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+------------+--------------------+--------------+
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| Test | Proto3StringField | 6 |
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+------------+--------------------+--------------+
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| Test2 | Proto3StringField | 7 |
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+------------+--------------------+--------------+
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| Test3 | Proto3StringField | 16 |
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+------------+--------------------+--------------+
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| Test4 | Proto3StringField | 20 |
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+------------+--------------------+--------------+
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grpc.gateway.testing.EchoResponse:
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+--------------+--------------------+--------------+
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| Field Name | Field Type | Field Number |
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+==============+====================+==============+
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| Message | Proto3StringField | 1 |
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+--------------+--------------------+--------------+
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| Name | Proto3StringField | 2 |
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+--------------+--------------------+--------------+
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| Age | Proto3IntField | 3 |
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+--------------+--------------------+--------------+
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| IsAdmin | Proto3BooleanField | 4 |
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+--------------+--------------------+--------------+
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| Weight | Proto3FloatField | 5 |
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+--------------+--------------------+--------------+
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| Test | Proto3StringField | 6 |
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+--------------+--------------------+--------------+
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| Test2 | Proto3StringField | 7 |
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+--------------+--------------------+--------------+
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| Test3 | Proto3StringField | 16 |
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+--------------+--------------------+--------------+
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| Test4 | Proto3StringField | 20 |
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+--------------+--------------------+--------------+
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| MessageCount | Proto3IntField | 8 |
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+--------------+--------------------+--------------+
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grpc.gateway.testing.ServerStreamingEchoRequest:
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+-----------------+-------------------+--------------+
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| Field Name | Field Type | Field Number |
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+=================+===================+==============+
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| Message | Proto3StringField | 1 |
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+-----------------+-------------------+--------------+
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| MessageCount | Proto3IntField | 2 |
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+-----------------+-------------------+--------------+
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| MessageInterval | Proto3IntField | 3 |
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+-----------------+-------------------+--------------+
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grpc.gateway.testing.ServerStreamingEchoResponse:
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+------------+-------------------+--------------+
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| Field Name | Field Type | Field Number |
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+============+===================+==============+
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| Message | Proto3StringField | 1 |
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+------------+-------------------+--------------+
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grpc.gateway.testing.ClientStreamingEchoRequest:
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+------------+-------------------+--------------+
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| Field Name | Field Type | Field Number |
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+============+===================+==============+
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| Message | Proto3StringField | 1 |
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+------------+-------------------+--------------+
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grpc.gateway.testing.ClientStreamingEchoResponse:
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+--------------+----------------+--------------+
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| Field Name | Field Type | Field Number |
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+==============+================+==============+
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| MessageCount | Proto3IntField | 1 |
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+--------------+----------------+--------------+
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```
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## Références
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- [Hacking into gRPC-Web Article by Amin Nasiri](https://infosecwriteups.com/hacking-into-grpc-web-a54053757a45)
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- [gRPC-Web Pentest Suite](https://github.com/nxenon/grpc-pentest-suite)
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{{#include ../banners/hacktricks-training.md}}
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