如何解决sshd_config不会通过Yocto元层覆盖，因此无法连接到开发板上 初始步骤
系统
- 硬件：PHYTEC PHYBOARD-Mira板
- 处理器：NXP i.MX6 Quad
- Yocto / OE 分支：
warrior
初始步骤
-
我有一个名为
meta-mylayer的自定义层，我希望在该层上更改带入硬件的图像。meta-yogurt层由Phytec提供，该层由其应用程序和其他与板相关的软件组成。 -
在我的层中，我有以下密码秘诀：
# meta-mylayer/recipe-images/images/phytec-headless-image.bbappend inherit extrausers EXTRA_USERS_PARAMS = "usermod -P yocto2020 root;"
执行bitbake -k phytec-headless-image并通过串行电缆连接电路板后，我可以使用root:yocto2020凭据登录电路板，但是在ssh -l root <StaticIPBoard>时，我一直无法访问。
基于此toradex forum thread，我在所有元层所在的目录中执行以下命令：
find . -name "*sshd_config*"
结果如下：
./meta-yogurt/recipes-connectivity/openssh/openssh/sshd_config
./poky/meta/recipes-connectivity/openssh/openssh/sshd_config
因此，我从sshd_config层复制了meta-yogurt，并取消了以下两行的注释：
AllowRootLogin Yes
PasswordAuthentication Yes
我层中配方的结构如下：
meta-mylayer/recipes-connectivity/
└── openssh
├── openssh
│ └── sshd_config # uncommented the necessary lines
└── openssh_%.bbappend
openssh_%.bbappend文件的内容如下：
FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
该图层已经在$BUILDDIR/conf/bblayers.conf中，因此我继续进行bitbake -k phytec-headless-image并将图像加载到板上。
命令ssh -v -l root <STATICIP>会引发以下错误：
$ ssh -v -l root 192.168.3.11
OpenSSH_6.6.1,OpenSSL 1.0.1f 6 Jan 2014
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to 192.168.3.11 [192.168.3.11] port 22.
debug1: Connection established.
debug1: identity file /home/des/.ssh/id_rsa type 1
debug1: identity file /home/des/.ssh/id_rsa-cert type -1
debug1: identity file /home/des/.ssh/id_dsa type -1
debug1: identity file /home/des/.ssh/id_dsa-cert type -1
debug1: identity file /home/des/.ssh/id_ecdsa type -1
debug1: identity file /home/des/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/des/.ssh/id_ed25519 type -1
debug1: identity file /home/des/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.6.1p1 Ubuntu-2ubuntu2.13
debug1: Remote protocol version 2.0,remote software version OpenSSH_7.9
debug1: match: OpenSSH_7.9 pat OpenSSH* compat 0x04000000
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-sha1-etm@openssh.com none
debug1: kex: client->server aes128-ctr hmac-sha1-etm@openssh.com none
debug1: sending SSH2_MSG_KEX_ECDH_INIT
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ECDSA 82:25:3c:5a:49:5e:61:ba:7c:0d:6b:b9:1d:78:9c:7c
debug1: Host '192.168.3.11' is known and matches the ECDSA host key.
debug1: Found key in /home/des/.ssh/known_hosts:46
debug1: ssh_ecdsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,password,keyboard-interactive
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /home/des/.ssh/id_rsa
debug1: Authentications that can continue: publickey,keyboard-interactive
debug1: Trying private key: /home/des/.ssh/id_dsa
debug1: Trying private key: /home/des/.ssh/id_ecdsa
debug1: Trying private key: /home/des/.ssh/id_ed25519
debug1: Next authentication method: keyboard-interactive
debug1: Authentications that can continue: publickey,keyboard-interactive
debug1: Next authentication method: password
root@192.168.3.11's password:
debug1: Authentications that can continue: publickey,keyboard-interactive
Permission denied,please try again.
sshd_config文件
我通过串行端口在板上
cat /etc/ssh/sshd_config | grep -i "rootlogin"
和AllowRootLogin选项仍被注释掉！
其他替代方案
我尝试了devtool modify openssh，并编辑了sshd_config，并使用SRC_URI_append将补丁添加到了我的图层，结果仍然相同。
local.conf EXTRA_IMAGE_FEATURES += "debug-tweaks"中的PS 已被注释。
问题
要在我的Yocto层中使用密码为root用户的SSH通过SSH到达董事会，需要做些什么？
解决方法
问题是EXTRA_IMAGE_FEATURES += "debug-tweaks"。我提到conf/local.conf中已将其注释掉。
解决方案是取消注释，以便产生效果。
之前：
conf/local.conf
#EXTRA_IMAGE_FEATURES += "debug-tweaks"
之后：
EXTRA_IMAGE_FEATURES += "debug-tweaks"
然后使用bitbake -k phytec-headless-image和ssh -l root <STATICIP>使用密码登录来构建新图像
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