Android安装系统CA证书

HTTPS抓包时, 如果应用不信任用户证书, 需要把证书安装为系统证书.

如果证书为二进制格式(cer, der), 需要先转换为文本格式

$ openssl x509 -inform der -in cert.cer -outform pem -out cert.pem

获取hash, 存为$CERT_HASH

$ CERT_HASH=`openssl x509 -inform pem -in cert.pem -subject_hash_old | head -1`

制作证书文件

$ cp cert.pem ${CERT_HASH}.0

$ openssl x509 -inform pem -in cert.pem -text -noout >> ${CERT_HASH}.0

push到设备中

$ adb root

$ adb remount

$ adb push ${CERT_HASH}.0 /system/etc/security/cacerts/

更改权限

$ adb shell chmod 644 /system/etc/security/cacerts/${CERT_HASH}.0

如果Android13以上无法remount, 可以尝试

1 2	$ adb shell setprop sys.debug.allow_remount true $ adb shell stop && adb shell start

或者使用overlayfs

$ adb shell
$ mkdir -p /data/overlay/upper
$ mkdir -p /data/overlay/work
$ mount -t overlay overlay -o lowerdir=/system/etc/security/cacerts,upperdir=/data/overlay/upper,workdir=/data/overlay/work /system/etc/security/cacerts
$ exit
$ adb push ${CERT_HASH}.0 /data/overlay/upper/

或者使用mount --bind

$ adb shell
$ mkdir -p /data/mnt
$ adb push ${CERT_HASH}.0 /data/mnt/
$ mount --bind /data/mnt/${CERT_HASH}.0 /system/etc/security/cacerts/${CERT_HASH}.0