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/etc/pam.d/ ssh 和登录规则

tag-icon • tag-icon login sshd pam selinux
/etc/pam.d/ ssh 和登录规则

在 中/etc/pam.d/， 的配置文件sshd和login都有一些规则selinux。当我不使用 selinux 时，我可以简单地禁用这些行吗？我想简化 pam 规则。

具体来说，这些行是：

session [success=ok ignore=ignore module_unknown=ignore default=bad]        pam_selinux.so close
session [success=ok ignore=ignore module_unknown=ignore default=bad]        pam_selinux.so open

我要求确定，因为我认为有时天真的注释行可能会干扰规则的流程。

完整sshd配置如下：

# PAM configuration for the Secure Shell service

# Standard Un*x authentication.
@include common-auth

# Standard Un*x authorization.
@include common-account

# SELinux needs to be the first session rule.  This ensures that any lingering context has been cleared.
# Without this it is possible that a module could execute code in the wrong domain.
session [success=ok ignore=ignore module_unknown=ignore default=bad]        pam_selinux.so close

# Set the loginuid process attribute.
session    required     pam_loginuid.so

# Create a new session keyring.
session    optional     pam_keyinit.so force revoke

# Standard Un*x session setup and teardown.
@include common-session

# Print the status of the user's mailbox upon successful login.
session    optional     pam_mail.so standard noenv # [1]

# Set up user limits from /etc/security/limits.conf.
session    required     pam_limits.so

# Read environment variables from /etc/environment and
# /etc/security/pam_env.conf.
session    required     pam_env.so # [1]
# In Debian 4.0 (etch), locale-related environment variables were moved to
# /etc/default/locale, so read that as well.
session    required     pam_env.so user_readenv=1 envfile=/etc/default/locale

# SELinux needs to intervene at login time to ensure that the process starts
# in the proper default security context.  Only sessions which are intended
# to run in the user's context should be run after this.
session [success=ok ignore=ignore module_unknown=ignore default=bad]        pam_selinux.so open

# Standard Un*x password updating.
@include common-password

答案1

pam_selinux.so为 PAM 会话设置 SELinux 安全上下文。如果 SELinux 是残疾人，PAM模块不会有任何影响，可以删除。

请注意，如果 SELinux 位于宽容的模式 SELinux 规则仍然使用但不强制执行。删除pam_selinux.so将导致进程在不正确的安全上下文中运行，这可能会在审核日志中生成大量 AVC 拒绝消息。

如果稍后启用 SELinux，pam_selinux.so则需要处于 PAM 配置中，用户登录才能正常工作。

答案2

我认为，如果您不确切知道这意味着什么，那么在尝试删除 pam 配置中的 2 行之前，您可以在配置文件中简化很多事情。这是我的 2 美分，因为我对 pam 一无所知。

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