adb-install-cert

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adb-install-cert

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Install certificates to android system store

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# adb-install-cert (root required)

This script automatically detect android version and choose preffered way to install certificate to system store.

If you want manually install certificate, see [my guide](https://gist.github.com/sysraccoon/d3169c9ac557ef0a12aa5aab1b3c883a)

## Usage

After installation, you can plug your device and run:

```sh
adb-install-cert --cert ~/path/to/cert.pem
```

If certificate format detect incorrectly, pass it directly (only `der` and `pem` support):
```sh
adb-install-cert --cert ~/path/to/cert.crt --cert-format der
```

By default `adb-install-cert` automatically select installation mode, based on android version.
If you want override it, pass `--mode` option (see `--help` or read technical description below for more information):
```sh
adb-install-cert --cert ~/path/to/cert.pem --mode temporary
```

If multiple devices present, you can specify one by serial:

```sh
adb-install-cert --cert ~/path/to/cert.pem --device-serial some-serial
```

As alternative, you can use environment variables, as described [here](https://github.com/openatx/adbutils?tab=readme-ov-file#environment):

```sh
ANDROID_SERIAL=emulator-5556 adb-install-cert --cert ~/path/to/cert.pem
```

## Installation

`adb` is required:
```sh
sudo apt install adb
```

install `adb-install-cert` from pypi:
```sh
pipx install adb-install-cert
```

or install development version from github:
```sh
pipx install git+https://github.com/sysraccoon/adb-install-cert.git
```

## Technical Description

**Before Android 10**, **permanent installation** of a certificate is possible by remounting the root directory in read-write mode. These changes may require a device reboot.

**Starting with Android 10**, the root system is available in read-only mode. To install a certificate, the utility uses remounting `/system/etc/security/cacerts` directory in `tmpfs` with a preliminary copy of all existing certificates. **After a reboot, the changes will be reset and the utility will need to be reused**.

**Starting with Android 14**, all logic described before used, but also in order for the changes to take effect, the utility updates the state of running processes.

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