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# 图像采集与挂载
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# 图像获取与挂载
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{{#include ../../banners/hacktricks-training.md}}
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## 采集
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## 获取
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> 始终进行**只读**获取并**在复制时进行哈希**。保持原始设备**写保护**，仅在经过验证的副本上工作。
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### DD
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```bash
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#This will generate a raw copy of the disk
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dd if=/dev/sdb of=disk.img
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# Generate a raw, bit-by-bit image (no on-the-fly hashing)
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dd if=/dev/sdb of=disk.img bs=4M status=progress conv=noerror,sync
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# Verify integrity afterwards
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sha256sum disk.img > disk.img.sha256
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```
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### dcfldd
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```bash
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#Raw copy with hashes along the way (more secur as it checks hashes while it's copying the data)
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dcfldd if=<subject device> of=<image file> bs=512 hash=<algorithm> hashwindow=<chunk size> hashlog=<hash file>
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dcfldd if=/dev/sdc of=/media/usb/pc.image hash=sha256 hashwindow=1M hashlog=/media/usb/pc.hashes
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```
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### FTK Imager
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### dc3dd / dcfldd
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您可以[**从这里下载 FTK imager**](https://accessdata.com/product-download/debian-and-ubuntu-x64-3-1-1)。
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`dc3dd` 是 dcfldd (DoD 计算机取证实验室 dd) 的积极维护分支。
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```bash
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ftkimager /dev/sdb evidence --e01 --case-number 1 --evidence-number 1 --description 'A description' --examiner 'Your name'
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# Create an image and calculate multiple hashes at acquisition time
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sudo dc3dd if=/dev/sdc of=/forensics/pc.img hash=sha256,sha1 hashlog=/forensics/pc.hashes log=/forensics/pc.log bs=1M
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```
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### EWF
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您可以使用[ **ewf tools**](https://github.com/libyal/libewf)生成磁盘映像。
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### Guymager
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图形化的多线程成像工具，支持 **raw (dd)**、**EWF (E01/EWFX)** 和 **AFF4** 输出，并具有并行验证功能。可在大多数 Linux 仓库中获取（`apt install guymager`）。
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```bash
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ewfacquire /dev/sdb
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#Name: evidence
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#Case number: 1
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#Description: A description for the case
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#Evidence number: 1
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#Examiner Name: Your name
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#Media type: fixed
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#Media characteristics: physical
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#File format: encase6
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#Compression method: deflate
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#Compression level: fast
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#Then use default values
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#It will generate the disk image in the current directory
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# Start in GUI mode
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sudo guymager
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# Or acquire from CLI (since v0.9.5)
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sudo guymager --simulate --input /dev/sdb --format EWF --hash sha256 --output /evidence/drive.e01
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```
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### AFF4 (高级取证格式 4)
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AFF4 是谷歌为 *非常* 大的证据（稀疏、可恢复、云原生）设计的现代成像格式。
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```bash
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# Acquire to AFF4 using the reference tool
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pipx install aff4imager
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sudo aff4imager acquire /dev/nvme0n1 /evidence/nvme.aff4 --hash sha256
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# Velociraptor can also acquire AFF4 images remotely
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velociraptor --config server.yaml frontend collect --artifact Windows.Disk.Acquire --args device="\\.\\PhysicalDrive0" format=AFF4
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```
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### FTK Imager (Windows & Linux)
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您可以 [下载 FTK Imager](https://accessdata.com/product-download) 并创建 **raw, E01 或 AFF4** 镜像：
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```bash
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ftkimager /dev/sdb evidence --e01 --case-number 1 --evidence-number 1 \
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--description 'Laptop seizure 2025-07-22' --examiner 'AnalystName' --compress 6
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```
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### EWF工具 (libewf)
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```bash
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sudo ewfacquire /dev/sdb -u evidence -c 1 -d "Seizure 2025-07-22" -e 1 -X examiner --format encase6 --compression best
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```
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### Imaging Cloud Disks
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*AWS* – 创建一个 **forensic snapshot** 而无需关闭实例：
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```bash
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aws ec2 create-snapshot --volume-id vol-01234567 --description "IR-case-1234 web-server 2025-07-22"
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# Copy the snapshot to S3 and download with aws cli / aws snowball
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```
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*Azure* – 使用 `az snapshot create` 并导出到 SAS URL。请参见 HackTricks 页面 {{#ref}}
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../../cloud/azure/azure-forensics.md
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{{#endref}}
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## 挂载
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### 几种类型
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### 选择正确的方法
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在 **Windows** 上，您可以尝试使用 Arsenal Image Mounter 的免费版本 ([https://arsenalrecon.com/downloads/](https://arsenalrecon.com/downloads/)) 来 **挂载取证镜像**。
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1. 当您需要原始分区表（MBR/GPT）时，挂载 **整个磁盘**。
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2. 当您只需要一个卷时，挂载 **单个分区文件**。
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3. 始终以 **只读** 模式挂载 (`-o ro,norecovery`) 并在 **副本** 上工作。
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### 原始
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```bash
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#Get file type
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file evidence.img
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evidence.img: Linux rev 1.0 ext4 filesystem data, UUID=1031571c-f398-4bfb-a414-b82b280cf299 (extents) (64bit) (large files) (huge files)
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#Mount it
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mount evidence.img /mnt
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```
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### EWF
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```bash
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#Get file type
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file evidence.E01
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evidence.E01: EWF/Expert Witness/EnCase image file format
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#Transform to raw
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mkdir output
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ewfmount evidence.E01 output/
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file output/ewf1
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output/ewf1: Linux rev 1.0 ext4 filesystem data, UUID=05acca66-d042-4ab2-9e9c-be813be09b24 (needs journal recovery) (extents) (64bit) (large files) (huge files)
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#Mount
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mount output/ewf1 -o ro,norecovery /mnt
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```
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### ArsenalImageMounter
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这是一个用于挂载卷的Windows应用程序。您可以在此处下载 [https://arsenalrecon.com/downloads/](https://arsenalrecon.com/downloads/)
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### 错误
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- **`cannot mount /dev/loop0 read-only`** 在这种情况下，您需要使用标志 **`-o ro,norecovery`**
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- **`wrong fs type, bad option, bad superblock on /dev/loop0, missing codepage or helper program, or other error.`** 在这种情况下，挂载失败是因为文件系统的偏移量与磁盘映像的偏移量不同。您需要找到扇区大小和起始扇区：
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### 原始镜像 (dd, AFF4-extracted)
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```bash
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# Identify partitions
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fdisk -l disk.img
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Disk disk.img: 102 MiB, 106954648 bytes, 208896 sectors
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Units: sectors of 1 * 512 = 512 bytes
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Sector size (logical/physical): 512 bytes / 512 bytes
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I/O size (minimum/optimal): 512 bytes / 512 bytes
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Disklabel type: dos
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Disk identifier: 0x00495395
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Device Boot Start End Sectors Size Id Type
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disk.img1 2048 208895 206848 101M 1 FAT12
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# Attach the image to a network block device (does not modify the file)
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sudo modprobe nbd max_part=16
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sudo qemu-nbd --connect=/dev/nbd0 --read-only disk.img
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# Inspect partitions
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lsblk /dev/nbd0 -o NAME,SIZE,TYPE,FSTYPE,LABEL,UUID
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# Mount a partition (e.g. /dev/nbd0p2)
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sudo mount -o ro,uid=$(id -u) /dev/nbd0p2 /mnt
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```
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请注意扇区大小为 **512**，起始为 **2048**。然后像这样挂载镜像：
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完成后分离：
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```bash
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mount disk.img /mnt -o ro,offset=$((2048*512))
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sudo umount /mnt && sudo qemu-nbd --disconnect /dev/nbd0
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```
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### EWF (E01/EWFX)
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```bash
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# 1. Mount the EWF container
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mkdir /mnt/ewf
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ewfmount evidence.E01 /mnt/ewf
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# 2. Attach the exposed raw file via qemu-nbd (safer than loop)
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sudo qemu-nbd --connect=/dev/nbd1 --read-only /mnt/ewf/ewf1
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# 3. Mount the desired partition
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sudo mount -o ro,norecovery /dev/nbd1p1 /mnt/evidence
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```
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或者使用 **xmount** 进行实时转换：
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```bash
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xmount --in ewf evidence.E01 --out raw /tmp/raw_mount
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mount -o ro /tmp/raw_mount/image.dd /mnt
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```
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### LVM / BitLocker / VeraCrypt 卷
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在附加块设备（loop 或 nbd）后：
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```bash
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# LVM
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sudo vgchange -ay # activate logical volumes
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sudo lvscan | grep "/dev/nbd0"
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# BitLocker (dislocker)
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sudo dislocker -V /dev/nbd0p3 -u -- /mnt/bitlocker
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sudo mount -o ro /mnt/bitlocker/dislocker-file /mnt/evidence
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```
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### kpartx helpers
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`kpartx` 自动将映像中的分区映射到 `/dev/mapper/`：
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```bash
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sudo kpartx -av disk.img # creates /dev/mapper/loop0p1, loop0p2 …
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mount -o ro /dev/mapper/loop0p2 /mnt
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```
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### 常见挂载错误及修复
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| 错误 | 典型原因 | 修复 |
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|-------|---------------|-----|
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| `cannot mount /dev/loop0 read-only` | 日志文件系统 (ext4) 未干净卸载 | 使用 `-o ro,norecovery` |
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| `bad superblock …` | 错误的偏移量或损坏的文件系统 | 计算偏移量 (`sector*size`) 或在副本上运行 `fsck -n` |
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| `mount: unknown filesystem type 'LVM2_member'` | LVM 容器 | 使用 `vgchange -ay` 激活卷组 |
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### 清理
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记得 **umount** 和 **disconnect** 循环/nbd 设备，以避免留下可能会损坏后续工作的悬挂映射：
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```bash
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umount -Rl /mnt/evidence
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kpartx -dv /dev/loop0 # or qemu-nbd --disconnect /dev/nbd0
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```
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## 参考
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- AFF4 成像工具公告与规格: https://github.com/aff4/aff4
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- qemu-nbd 手册页（安全挂载磁盘映像）: https://manpages.debian.org/qemu-system-common/qemu-nbd.1.en.html
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{{#include ../../banners/hacktricks-training.md}}
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