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Linux-PAM系统管理指南[转]

June 17th, 2008 Posted in Linux

来自:http://doc.linuxpk.com/5214.html
联系:linuxmine#gmail.com

Linux-PAM是一组共享库,使用这些模块,系统管理者可以自由选择应用程序使用的验证机制。也就是说,勿需重新编译应用程序就可以切换应用程序 使用的验证机制。甚至,不必触动应用程序就可以完全升级系统使用的验证机制。(2002-07-09 13:08:42)

By 书生, 出处:Morgan, Andrew G.

1.简介

Linux-PAM(Pluggable Authentication Modules for Linux.基于Linux的插入式验证模块)是一组共享库,使用这些模块,系统管理者可以自由选择应用程序使用的验证机制。也就是说,勿需重新编译应用 程序就可以切换应用程序使用的验证机制。甚至,不必触动应用程序就可以完全升级系统使用的验证机制。

在历史上,需要对用户进行验证的 应用程序,必须同某种验证机制编译到一起。例如,传统的UN*X系统是使用密码对用户进行校验的。用户输入的密码经过crypt加密后,然后和/etc /passwd文件中的密文进行比较。在这种系统中,如果优先权的识别不是基于这种方式,就需要通过用户识别符和用户组识别符对优先权进行验证。服务和应 用程序可以使用基于用户和用户组识别的验证方式。通常,用户组的分配是通过/etc/group文件。

不幸的是,随着计算机速度的加快和网络的大范围普及,使用这种验证方式越来越不安全了。因此,人们开发了许多新的验证方法。

Linux-PAM工程的目的就是分离应用软件和验证机制的开发。通过验证函数库可以实现上述目的。PAM库由本地的系统配置文件 /etc/pam.conf或者/etc/pam.d/目录下的一些配置文件来设置。而模块以动态可加载目标文件(使用dloptn(3)函数打开)的形 式保存在/usr/lib/security目录中。

2.关于本文的一些说明

在开始阅读本文时,你应该清楚本文假定特定的文件是在特定的目录中。我们遵照RFC-86的约定。有些Linux发布把这些文件放在不同的位置,因此如果你的系统是象RedHat之类的发布,那么你应该谨慎使用本文提供的例子。

例如,本文假设PAM可加载目标文件(模块)是在/usr/lib/security/目录下,而在RedHat Linux系统中它们被放在了/lib/security目录下。因此,使用本文的例子时应该注意进行必要的转换。

3.综述

我们从一个例子开始讨论。首先找一个能够为用户提供服务的应用程序,login就是一个这样的程序。login要做两件事,首先查询用户,然后为用户提供所需服务,例如提供一个shell程序。

通常,login会提示用户输入密码。然后对密码进行校验,这项任务就是Linux-PAM完成的。

从程序员的角度看,Linux-PAM的任务就是校验用户的合法性。

Linux-PAM具有很大的灵活性,系统管理者可以通过它自由选择使用的验证方式。你也可以自由选择应用程序使用的验证方式。Linux-PAM能够提供的验证方式多种多样,从绝对信任(pam_permit)到视网膜扫描、音频分析以及一次性口令,不一而足。

为了描述Linux-PAM的灵活性,我们可以假想一种情况:一个系统管理者(父母)希望提高用户(他们的子女)的数学能力。他/她就可以通过一个孩子 们非常喜欢的游戏“Shoot ’em up game”达成上述目的,当然前提是这个游戏能够使用PAM提供的验证机制。验证可以设置:每次孩子们要玩游戏时,都需要回答出一组小于12的随机数的乘 积。这样孩子们每次玩游戏之前都可以练习乘法运算。随着他们的成长,可以增加数字的大小。

Linux-PAM处理四种类型的任务:验证管理(auth)、帐户管理(account)、会话管理(session)和口令管理(password)。应用程序使用的管理方式通过相关的Linux-PAM配置文件设置。管理功能是有配置文件指定的模块完成的。

应用程序X,它通过一些接口调用Linux-PAM库,而自己并不知道使用的验证方法。Linux-PAM库读出PAM配置文件的内容,根据配置文件加 载程序X需要的模块。这些模块进入某个管理组并且按照配置文件设置的顺序层叠在一起。它们为应用程序执行各种验证任务。应用程序和用户之间通过 conversation函数实现信息交换。

3.1 入门

下面是Seth Chaiklin说的一段话:

从这一点来看,PAM应该工作在理想世界中,在这里所有的应用程序都没有错误。然而,事实远非如此。因此,如果你要使用PAM,需要考虑一些实际的问题。

如果你把Linux用作一个单用户系统,或者系统中的用户是相互信任的,那使用PAM没有多大意思。

你可以在没有重要东西的系统上取消PAM,这实际上可以带来一些方便。使系统象Win95。

在网络环境下,就需要考虑用户验证的问题了。

如果你使用Linux作为一个服务器,用它来提供一些不同的服务,这时PAM就体现了它的价值。一般情况下,通过使用不同的模块,程序可以搜索各种密码数据库,而程序本身勿需改写。下面是一些例子:

apache有一个模块能够提供PAM服务。因此,对于特定目录的验证可以通过PAM完成,这意味着大量现有的PAM模块可以用来进行验证工作,包括RADIUS、NIS、NCP。

pppd有一个使用PAM验证的版本(来自RedHat)。

我可以把PAM由于任何需要验证的程序吗?

可以说能也可以说不能。能,是指如果你能够修改源代码,就可以加入PAM验证功能;不能是指如果你无法修改源代码,那么在二进制可执行文件汇中是无法加入PAM验证功能的。

我怎样才能区分程序是否使用了PAM验证?

使用ldd命令,如果这个程序的使用的动态连接库没有libpam和libpam_misc,那它肯定不使用PAM验证。然而,还有可能已经包含这两个库了,但是因为某些问题,程序无法正常工作。因此需要更好的方法来测试。

对于需要使用PAM的程序,需要在/etc/pam.d目录中为其设置配置文件。配置文件的名字被编写进程序源代码中,通常和程序的名字是一样的,但不 总是这样。例如:有个程序叫作pamprog,它的PAM配置文件是/etc/pam.d/pamprog。在配置文件中,只有下面两行: auth required pam_permit.so

auth required pam_warn.so

现在对其进行测试。第一行,表示所有的用户都允许通过;第二行表示想syslog中写入一条警告信息。如果测试成功,就表示程序能够使用PAM进行验证。然后你可以在配置文件中加入更为复杂的验证功能。

4.Linux-PAM配置文件

Linux-PAM的目标就是为系统管理者提供最大限度的灵活性。系统管理者可以通过两种形式对Linux-PAM进行配置:单一配置文件/etc/pam.conf;或者是/etc/pam.d/目录。这一节我们将讨论其配置文件的语法。

4.1 配置文件的语法

读者首先应该明白Linux-PAM的记号是大小写敏感的。有两个特殊的符号:#和。配置文件中的注释以#开头,一般配置文件中每行是一个入口(除了注释),但是如果某个入口的定义很长,可以通过使用转义符回行,而下一行也被看作是这个入口的一部分。

一般/etc/pam.conf文件每行都是这种格式:

service-name module-type control-flag module-path arguments

下面我们将对每个记号进行解释。除了这种方式之外,还可以使用/etc/pam.d/目录对Linux-PAM进行配置,稍后我们将对这种方式进行讲述。

service-name

为这个入口分配的服务名。通常这是给定应用程序的会话名。例如:ftpd、rlogind、su等等。

Linux-PAM还为默认的验证机制保留一个特殊的服务名,就是OTHER,大小写均可。注意,如果某个模块指定了以命名的服务,那OTHER就被忽略。

modle-type

Linux-PAM当前有四种类型的模块:

auth

这种类型的模块为用户验证提供两方面的服务。

让应用程序提示用户输入密码或者其它的标记,确认用户的合法性;

通过它的凭证许可权限,设定组成员关系(不同于上面讨论的/etc/groups文件)或者其它优先权。

account

这类模块执行基于非验证的帐户管理。它主要用来限制/允许用户对某个服务的访问时间,当前有效的系统资源(最多可以有多少个用户),限制用户的位置(例如:root用户只能从控制台登录)。

session

这类模块的主要用途是处理为用户提供服务之前/后需要做的一些事情,包括:记录打开/关闭交换数据的信息,监视目录等。

password

用来升级用户验证标记。

control-flag

控制标志用来设置验证成功或者失败后PAM需要作出的反应。因为模块可以层叠(stacked,同样类型的模块依次执行),控制标志可以决定每个模块的 重要性。应用程序不会意识到单个模块成功或者失败,它只会收到Linux-PAM库成功或者失败的综合反应信息。层叠模块的执行顺序取决于/etc /pam.conf文件的入口顺序,入口列前的模块先执行。从Linux-PAM 6.0开始可以使用两种语法定义控制标志。

简单的一种是使用单一关键词定义控制标志。有四个这样的关键词:required、requisite、sufficient和optional。

Linux-PAM通过如下方式解释这些关键词:

required

表示即使某个模块对用户的验证失败,也要等所有的模块都执行完毕之后,PAM才返回错误信息。这样做是为了不让用户知道被哪个模块拒绝。如果对用户验证成功,所有的模块都会返回成功信息。

requisite

如果特定的模块对用户的验证失败,PAM马上返回一个错误信息,把控制权交回应用程序,不再执行其它模块进行验证。

sufficient

表示如果一个用户通过这个模块的验证,PAM结构就立刻返回验证成功信息,把控制权交会应用程序。后面的层叠模块即使使用requisite或者required控制标志,也不再执行。如果验证失败sufficient的作用和optional相同。

optional

表示即使本行指定的模块验证失败,也允许用户享受应用程序提供的服务。使用这个标志,PAM框架会忽略这这个模块产生的验证错误,继续顺序执行下一个层叠模块。

还有一种比较复杂的语法来设置控制标志,它由一组value=action形式的标记组成,标记之间以空格分开:

[value1=action1 value2=action2 …]

valueN可以是下列Linux-PAM库的返回值:success、open_err、symbol_err、service_err、 system_err、buf_err、perm_denied、auth_err、cred_insufficient、 authinfo_unavail、user_unknown、maxtries、new_authtok_reqd、acct_expired、 session_err、cred_unavail、cred_expired、cred_err、no_module_data、conv_err、 authtok_err、authtok_recover_err、authtok_lock_busy、authtok_disable_aging、 try_again、ignore、abort、authtok_expired、module_unknown、bad_item和default。最 后一个(default)能够用来设置上面的返回值无法表达的行为。

actionN可以是一个非负整数或者是下面的记号之 一:ignore、ok、done、bad、die和reset。如果是非负整数J,就表示需要忽略后面J个同样类型的模块。通过这种方式,系统管理者可 以更加灵活地设置层叠模块,模块的层叠路径由单个模块的反应决定。

ignore

如果使用层叠模块,那么这个模块的返回值将被忽略,不会被应用程序知道。

bad

它表示这个返回码应该被看作是模块验证失败。如果这个模块是层叠模块的第一个验证失败的模块,那么它的状态值就是整个层叠模块的状态值。

die

终止层叠模块验证过程,立刻返回到应用程序。

ok

告诉PAM这个模块的返回值直接作为所有层叠模块的返回值。也就是说,如果这个模块前面的模块返回状态是PAM_SUCCESS,那这个返回值就会覆盖前面的返回状态。注意:如果前面的模块的返回状态表示模块验证失败,那么不能使用这个返回值覆盖。

done

终止后续层叠模块的验证,把控制权立刻交回应用程序。

reset

清除所有层叠模块的返回状态,从下一个层叠模块重新开始。

module-path

PAM验证模块的路径。如果以/开头,就表示是完整的路径;如果不是以/打头,就表示是相对于/usr/lib/security的相对路径。

args

传递给模块的参数。类似于通常的Linux Shell命令行参数。有效的参数包括一些通用参数和特定于给定模块的参数。无效的参数将被忽略,并会把错误信息记录到syslog。

注意:配置文件中的任何一行错误都会导致验证失败,同时相关错误信息被记录到syslog。

4.2 基于目录的配置形式

从Linux-PAM 5.6版开始引入了一种基于目录的配置方式,通过/etc/pam.d/目录下的文件对PAM进行配置。这种方式比单一的配置文件具有更大的灵活性。这个目录下的所有配置文件都以某个服务名命名(小写)。

不过,这两种配置方式不能同时起作用,也就是说,你只能使用其中一种对Linux-PAM进行配置。一般/etc/pam.d/优先。

/etc/pam.d/目录下的配置文件的语法和/etc/pam.conf文件的语法相似,形式如下:

module-type control-flag module-path arguments

和/etc/pam.conf文件语法的唯一不同就是没有服务名(service-name),服务名由文件名设置。例如:/etc/pam.d/login文件保存对login服务的设置。

这种配置方式与单一配置文件相比,具有很大的优越性:

减少了配置错误的几率。

更易于维护。

可以通过使用不同配置文件的符号连接决定系统的验证策略。

可以加快对于配置文件的解析。

可以对单个的Linux-PAM配置文件设置不同的存取权限。

更易于软件包的管理。

4.3 通用参数

下面是一些通用参数,可以被所有的模块解析:

debug

通过syslog系统调用记录调试信息。

nowarn

使模块不要向应用程序输出警告信息。

use_first_pass

使模块不提示用户输入密码,而是使用为前一个验证模块输入的密码。如果无效,则验证失败。这个参数只能用于auth和password类型模块。

try_first_pass

首先使用用户为上一个模块输入的密码进行验证,如果不行,就提示用户输入密码,这个参数只能用于auth类型的模块。

use_mapped_pass

这个参数目前还不能被任何Linux-PAM模块支持,主要因为美国加密算法的出口限制。

expost_account

通常,对于模块来说泄露用户的某些信息并非一个安全的策略。有时候用户名、起始目录或者用户使用的shell等信息都可以被攻击者用来攻击一个用户帐户。这个参数是一个适用于每个模块的标准参数,它可以使模块尽量少地泄露用户信息。

4.4 配置文件入口示例

在这一节,我们将给出一些例子,以便于理解。

4.4.1 默认策略

一个合理的OTHER入口对于加强系统安全非常重要。下面是一个非常偏执的例子。

# 默认; 拒绝访问

#

OTHER auth required /usr/lib/security/pam_deny.so

OTHER account required /usr/lib/security/pam_deny.so

OTHER password required /usr/lib/security/pam_deny.so

OTHER session required /usr/lib/security/pam_deny.so

毫无疑问,这是最安全的OTHER策略了,但是不太合理。例如:如果这个文件的其它部分编写不好,那么很容易把所有的用户挡在门外。

pam_deny模块在运行时不记录任何信息,除非用户在无法执行某个服务程序时能够与系统管理人员联系,否则系统管理者很长时间不会知道系统配置错误。

在上面例子的前面加入以下几行,系统管理者就可以获得有关的警告信息了:

# 如果程序配置错误

#

OTHER auth required /usr/lib/security/pam_warn.so

OTHER password required /usr/lib/security/pam_warn.so

这样有两行是auth模块类型,形成模块层叠。

在一个使用/etc/pam.d/配置的系统中,默认配置文件如下:

# default configuration: /etc/pam.d/other

#

auth required /usr/lib/security/pam_warn.so

auth required /usr/lib/security/pam_deny.so

account required /usr/lib/security/pam_deny.so

password required /usr/lib/security/pam_warn.so

password required /usr/lib/security/pam_deny.so

session required /usr/lib/security/pam_deny.so

对于不熟悉Linux-PAM的系统管理者,下列几行可以作为最基本的系统配置:

# default; standard UNIX access

#

OTHER auth required /usr/lib/security/pam_unix_auth.so

OTHER account required /usr/lib/security/pam_unix_acct.so

OTHER password required /usr/lib/security/pam_unix_passwd.so

OTHER session required /usr/lib/security/pam_unix_session.so

通常这足以为大多数应用程序提供验证服务了。但是,大多数并不表示全部。如果你需要打开FTP匿名登录功能,就无法满足要求了。

为了打开匿名FTP,需要使用以下的配置命令代替默认的配置(OTHER):

# ftpd; add ftp-specifics. These lines enable anonymous ftp over

# standard UNIX access (the listfile entry blocks access to

# users listed in /etc/ftpusers)

#

ftpd auth sufficient /usr/lib/security/pam_ftp.so

ftpd auth required /usr/lib/security/pam_unix_auth.so use_first_pass

ftpd auth required /usr/lib/security/pam_listfile.so

onerr=succeed item=user sense=deny file=/etc/ftpusers

由于需要忽略默认的配置入口,所以第二行是必须要有的。这还是一个层叠模块的例子。使用sufficient控制标志,表示如果这个模块验证通过,就不必使用后面的层叠模块进行验证了;use_first_pass表示使用为前面的模块(pam_ftp)输入的密码。

5.Linux-PAM的安全问题

这一章我们将讨论如何安全使用Linux-PAM。

5.1 如果出现错误

如果发生错误,Linux-PAM可能会改变系统的安全性。这取决于你自己的选择,你可以选择不安全(开放系统)和绝对安全(拒绝任何访问)。通常,Linux-PAM在发生错误时,倾向于后者。任何的配置错误都可能导致系统整个或者部分无法访问。

能够遇到最大的问题可能就是Linux-PAM的配置文件(/etc/pam.d/*或者/etc/pam.conf)被删除了。如果发生这种事情,你的系统就会被锁住。

不过,还是有办法进行恢复的。最好的方法就是重新启动系统进入单用户模式,然后进行正确地设置。下面是David Wood在邮件中提出的解决步骤:

首先,以单用户模式启动系统,出现LILO boot:时输入: LILO boot:linux single >——此处假设使用的内核标签是linux,可以按TAB键列出可用的内核

这样你不用登录就可以进入系统了。

如果这个办法不行,你还可以使用急救盘启动系统。

假设你的PAM系统只是配置文件被破坏,先按照如下步骤进行处理: cd /etc

mv pam.conf pam.conf.orig

mv pam.d pam.d.orig

mkdir pam.d

cd pam.d

接着,使用编辑程序编辑/etc/pam.d/other文件,它应该包括以下四行:

auth required pam_unix_auth.so

account required pam_unix_acct.so

password required pam_unix_passwd.so

session required pam_unix_session.so

然后,你就可以登录了。如果还是不行,那有可能是因为输入错误或者更严重的问题。如果是输入错误,会在日志文件中留下记录,可以使用tail /var/log/messages查看。

现在,你已经重新登录到系统了。下面的工作就是重新安装Linux-PAM和其它软件(假设是RedHat系统),使用如下命令重新安装PAM软件包: rpm -Uvh –force pam-*

然后,需要安装(重新安装)libc库、util-linux、wuftp、NetKit等受影响的软件包。如果使用X系统,也需要重新安装。

5.2 不要使用脆弱的other文件

如果系统默认配置文件other的配置比较脆弱,系统很可能受到攻击的威胁。

这是一个示例配置,pam_deny模块将拒绝所有的访问,而pam_warn模块将向auth.notice日志设备发送一条警告信息:

# The PAM configuration file for the `other’ service

#

auth required pam_deny.so

auth required pam_warn.so

account required pam_deny.so

account required pam_warn.so

password required pam_deny.so

password required pam_warn.so

session required pam_deny.so

session required pam_warn.so

6.模块使用参考

这一章我们将一块介绍Linux-PAM模块的用法

6.1 access模块

6.1.1 概要

模块名

pam_access

作者

Alexei Nogin

维护者

作者

提供的管理组功能

account

系统依赖性

需要一个配置文件。默认情况下,使用/etc/security/access.conf作为配置文件,也可以指定别的文件。

网络支持

通过PAM_TTY变量获得终端名,如果这个变量没有设置,就通过ttyname()函数获得标准输入文件描述符的终端名。还可以使用 gethostname(),yp_get_default_domain(), gethostbyname()函数获得主机名、域名等信息,作为每个配置行的第三项。

6.1.2 综述

提供一种日志监控风格的登录访问控制机制

6.1.3 account组件

能够识别的参数

accessfile=/path/to/file.conf

描述

这个模块提供一种日志监控风格的登录访问控制机制,这种机制是基于登录名、主机名、域名、internet地址、网络地址或者终端名的。A. Nogin把logdaemon-5.6(作者:Wietse Venema’s)中的login_access.c文件做了许多改动,用到了这个模块中。

这个模块的行为可以使用如下参数进行修正:

accessfile=/path/to/file.conf 使用别的配置文件代替默认的配置文件/etc/security/access.conf。

示例和建议

例如:在一个NIS服务器或者一个邮件服务器上,有很多用户,但是你不想让这些用户具有登录(login)能力。这时,建议你使用这个模块。

如果你的模块放在/lib/security目录,而且使用/etc/pam.d/风格的配置,可以在/etc/pam.d/login、 /etc/pam.d/rlogin、/etc/pam.d/rsh和/etc/pam.d/ftp文件中加入下面一行,来启动这个模块:

account required /lib/security/pam_access.so

注意:除非你的系统可以忽略.rhosts文件的作用,否则这个模块无法发挥作用。其中细节请参考对pam_rhost_auth模块的介绍。

此外,在软件的发布中有一个示例access.conf配置文件。

6.2 chroot模块

6.2.1 概要

模块名

pam_chrooot

作者

Bruce Campbell

维护者

作者

提供的管理组功能

account、session、authentication

网络支持

本地主机

6.2.2 综述

这个模块为普通用户提供一个假的文件系统,例如:在他们看来的/目录实际上是/some/where/else。

如果系统中有几类用户,而你对安全问题又十分重视,就可以使用这个模块。它可以对用户能够看到的系统信息和能够运行的程序进行限制。

6.2.3 account组件

原著尚未完成

6.2.4 session组件

同上

能够识别的参数

可以使用PAM的通用参数和日志级别作为其参数。

示例和建议

提供合理的程序,例如只提供cat、ls、rm、cp和ed等。

不要滥用这个模块,例如:你可以为每个用户安装一个隔离的环境,但是这样非常浪费磁盘空间。

6.3 密码强度检查模块

6.3.1 概要

模块名

pam_cracklib

作者

Cristian Gafton

维护者

作者

提供的管理组功能

password

系统依赖性

需要libcrack库和字典/usr/lib/cracklib.dict。

6.3.2 综述

这个模块可以插入到实现password管理组功能的层叠模块中,为给定的程序提供密码强度检查。

这个模块以如下方式工作:首先调用cracklib例程检查密码强度,如果密码不易破译,就进行下面的强度检查:

新密码是否旧密码的回文。

新密码是否只是就密码改变了大小写

和旧密码是否相似。主要由difok参数控制,如果新旧密码之间不同的字符数目大于或等于这个参数就接受新的密码,这个参数的默认值是10或者新密码的 1/2。为了避免对一个很长、很复杂的密码进行查询,还可以使用 difignore参数。这个参数可以指定一个值,如果新的密码长度超过这个值,就不必进行这种检查,默认值是23。

是否新密码太短。由5个参数控制:minlen、dcredit、ucredit、lcredit和ocredit。在此就不一一介绍了。

新密码是否是旧密码的回环

这个密码以前是否用过。过去用过的密码可以在/etc/security/opasswd文件中找到。

对于标准的UNIX密码加密算法,即使没有参数,这个模块也会工作得很好。但是,对于MD5加密算法,密码可以超过8个字符,使用默认的设置将使用户很 难找到满意的密码。MD5算法的默认设置要求新密码中和旧密码相同的字符不能超过1/2,而且是强制的。例如:旧的密码是”the quick brown fox jumped over the lazy dog”,那这个密码是很难被替换的:)。除此之外,MD5算法的默认设置还允许密码长度小于5个字符。因此,对于MD5系统需要对配置做一些调整,提高 字符数的底限,减小对不同字符的比例限制。

6.3.3 password组件

能够识别的参数

debug、type=XXX、retry=N、difok=N、minlen=N、dcredit=N、ucredit=N、lcredit=N、ocredit=N、use_authtok

描述

这个模块提示用户输入一个密码,然后根据一个系统字典和一组规则检查它的强度。

默认情况下,它首先提示用户输入一个密码,如果认为强度足够,就提示用户重新输入一遍,以保证密码输入正确。完成这些动作后,就把这个密码产地给subsequent模块,由subsequent模块安装新的验证记号(也就是密码)。

这个模块的动作可以通过一些参数改变:

debug

把模块详细的行为信息写到syslog,但不包括密码信息。

type=xxx

修改提示信息。默认的提示信息是:”New UNIX password:”和”Retype UNIX password”。设置这个选项可以使xxx代替UNIX。

retry=N

改变输入密码的次数,默认值是1。就是说,如果用户输入的密码强度不够就退出。可以使用这个选项设置输入的次数,以免一切都从头再来。

difok=N

默认值为10。这个参数设置允许的新、旧密码相同字符的个数。不过,如果新密码中1/2的字符和旧密码不同,则新密码被接受。

minlen=N

密码字符个数下限加一。除了限制新密码字符的个数之外,还有一些参数可以限制每种字符(other、upper、lower和digit)的个数。minlen的默认值是9,这个值对于旧风格的UNIX密码是非常合适的,但是对于MD5系统却并不是很安全。

ucredit=N

限制新密码中最多有多少个大写字符。

lcredit=N

限制新密码中最多有多少个小写字符。

ocredit=N

限制新密码中最多有多少个其它的字符。

use_authok

不让模块执行提示用户输入密码的动作,使用前面层叠的password模块提供的密码。

示例和建议

下面我们举一个例子,看一下这个模块是如何与pam_pwdb的password组件实现层叠的:

# These lines stack two password type modules. In this example the

# user is given 3 opportunities to enter a strong password. The

# “use_authtok” argument ensures that the pam_pwdb module does not

# prompt for a password, but instead uses the one provided by

# pam_cracklib.

#

passwd password required pam_cracklib.so retry=3

passwd password required pam_pwdb.so use_authtok

下面是一个使用MD5加密算法的例子:

#

# These lines allow a md5 systems to support passwords of at least 14

# bytes with extra credit of 2 for digits and 2 for others the new

# password must have at least three bytes that are not present in the

# old password

#

password required pam_cracklib.so

difok=3 minlen=15 dcredit= 2 ocredit=2

password required pam_pwdb.so use_authtok nullok md5

6.4 拒绝模块

6.4.1 概要

模块名

pam_deny

作者

Andrew G. Morgan

维护者

当前Linux-PAM的维护者。

提供的管理组功能

account、authentication、password、session

clean code base

clean

6.4.2 综述

这个模块能够用来拒绝任何访问。它是向应用程序反馈验证失败的信息。这个模块比较适合于other文件。

6.4.3 帐户组件

描述

这个组件只是返回一个失败信息。失败的类型是PAM_ACCT_EXPIRED。

示例和建议

应用程序是通过引用Linux-PAM的帐户管理函数pam_acct_mgmt(),让用户获得系统的访问权。但是,如果把这个模块和account类型的模块层叠,用户将不能通过应用程序获得系统访问权。

下面的配置行将使任何用户都无法登录:

# add this line to your other login entries to disable all accounts

#

login account required pam_deny.so

6.4.4 验证组件

描述

这个组件只是返回失败信息,错误类型取决于应用程序调用的函数。如果应用程序试图调用pam_authenticate()函数验证用户,则失败类型是 PAM_AUTH_ERR;如果应用程序调用pam_setcred()函数,以建立和设置用户的验证凭证,则失败类型是 PAM_CRED_UNAVAIL。

示例和建议

如果想使应用程序拒绝为用户提供服务,可以在配置文件中加入以下配置行:

# add this line to your existing OTHER entries to prevent

# authentication succeeding with default applications.

#

OTHER auth required pam_deny.so

6.4.5 密码组件

描述

这个组件能够拒绝用户修改密码。如果收到修改密码的企图,它将返回PAM_AUTHOK_ERR类型的失败信息。

示例和建议

这个组件用于阻止应用程序改变用户的密码。例如,为了阻止login在旧密码失效时,自动提示用户输入新的密码,你可以在配置文件中加入以下配置行:

# add this line to your other login entries to prevent the login

# application from being able to change the user’s password.

#

login password required pam_deny.so

6.4.6 会话组件

描述

deny模块的这个组件能够阻止应用程序在主机上启动会话过程。

示例和建议

这个模块能够阻止用户启动一个shell。如果和pam_motd模块层叠,我们可以在配置文件中加入以下配置行,告诉用户现在是系统维护时间:

# An example to see how to configure login to refuse the user a

# session (politely)

#

login session required pam_motd.so

file=/etc/system_time

login session required pam_deny.so

6.5 环境变量设置/取消模块

6.5.1 概要

模块名

pam_env

作者

Dave Kinchlea

维护者

作者

提供的管理组类型

authentication(setcred)

系统依赖性

/etc/security/pam_env.conf

6.5.2 综述

使用这个模块可以设置/取消环境变量的定义。

6.5.3 验证组件

能够识别的参数

debug、conffile=configuration-file-name、envfile=/env-file-name、readenv=/0|1

描述

你可以使用固定的字符串通过这个模块设置变量或者取消对环境变量的设置。设置的环境变量值和PAM_ITEM是与或者或的关系。

这些由一个配置文件控制,默认情况下,配置文件是/etc/security/pam_env.conf。不过,可以通过connfile文件指定其它 的配置文件。配置文件的每个配置行都是以环境变量名开头,接着是两个选项:DEFAULT、OVERRIDE。DEFAULT表示:把这个变量设置为默认 值,如果不存在就把它的值设置为一个空字符串。OVERRIDE表示:使用新的值得覆盖默认值。如果OVERRIDE之后,没有定义变量值,就假定是空字 符串,而且不会执行覆盖动作。

VARIABLE [DEFAULT=[value]] [OVERRIDE=[value]]

环境变量可以以$(string)的语法使用,而PAM_ITEM可以通过@(string)的语法使用。如果string中含有$、@字符,需要在前 面加上反斜杠作为转义符,例如:$。当需要空格时,可以使用引号,但是空格不能环境变量的名字中出现。环境变量的值必须以引号分割。

这个模块也能够以KEY=VAL对的方式解析文件,每个KEY=VAL对占一行,默认文件是/etc/environment。你可以使用envfile选项改变需要解析的文件,使用readenv选项打开/关闭解析的文件。

这个模块的行为可以修改以下参数来设置:

debug

向syslog写入更多信息。

confile=filename

默认配置文件是/ec/security/pam_env.conf。这个选项指定的文件可以覆盖默认文件。不过,你必须使用完整的文件路径。

envfile=filename

默认是/etc/environment,使用这个选项指定其它的文件。也需要使用完整的文件路径。

readenv=0|1

打开(1)/关闭(0)从envfile中读取环境变量。默认情况下,这个选项为开(1)。

示例和建议

参考/etc/security/pam_env.conf文件。

6.6 过滤模块

6.6.1 概要

模块名

pam_filter

作者

Andrew G. Morgan

维护者

作者

提供的管理组功能

account、authentication、password、session

Clean code base

This module compiles cleanly on Linux based systems.

系统依赖性

需要安装pam_filter程序。

6.6.2 综述

这个模块为应用程序提供了一个插入式的过滤器。由于为某个程序重新编写过滤代码实现过滤功能是不太现实的,简直是开玩笑。这个模块能够对输入流中的大小写字符进行替换,然后输出到输出流。

6.6.3 Account+Authentication+Password+Session组件

能够识别的参数

debug、new_term、non_term、runX

描述

这个模块的所有组件都可能会执行所需要的过滤程序。过滤程序是以调用的程序的权限运行的,而不是以用户的权限运行。因此,普通用户只能关闭他们的会话过程才能杀死过滤进程。

pam_filter模块的行为可以由Linux-PAM配置文件传递的参数改变:

debug

模块运行时,syslog记录更多的信息。

new_term

作为一种默认的行为,过滤器会设置PAM_TTY选项,指示用户与应用程序进行联系的终端。这个参数表示过滤程序应该把PAM_TTY设置为被过滤的伪终端。

no_term

不必设置PAM_TTY选项。

runX

为了使这个模块能够执行一个过滤程序,应该让它知道何时执行。可以使用这个参数实现上述目的。这个参数紧跟过滤程序的路径名以及其命令行参数。

X的值可以是1和2。它表示过滤程序运行的确切时间。对于每种管理组功能,它会牵扯到不同的函数调用。

在authentication和session组件中,分别牵扯到两个函数。对于authentication管理组,这两个函数是 _authenticate和_setcred。run1表示从_authenticate函数运行过滤程序;run2表示从_setcred函数运行过 滤程序。对于session管理组,run1表示过滤程序从_open_session函数运行;run2是从_close_session函数运行。

对于account组件,run1和run2是一样的。

对于password管理组组件,run1表示过滤程序在_chauthtok函数首次运行时(PAM_PRELIM_CHECK阶段)执行;而run2表示过滤程序是在_chauthtok第二次运行时(PAM_UPDATE_AUTHOK阶段)执行。

示例和建议

你可以在login的配置文件(/etc/pam.d/login)中加入下面入口,实际尝试一下这个模块的应用:

# An example to see how to configure login to transpose upper and

# lower case letters once the user has logged in(!)

#

login session required pam_filter.so

run1 /usr/sbin/pam_filter/upperLOWER

6.7 匿名访问模块

6.7.1 概要

模块名

pam_ftp

作者

Andrew G. Morgan

维护者

作者

提供的管理组功能

authentication

网络支持

提示用户输入email地址

6.7.2 综述

这个模块的用途是提供一种插入式的匿名FTP访问模式。

6.7.3 authentication组件

能够识别的参数

debug、users=xxx,yyy,….、ignore

描述

这个模块解释用户名和密码,如果用户名是ftp或者anonymous,而用户的密码是以@分割的,它就会把@前后两部分分别设置为 PAM_RUSER和PAM_RHOST选项的值。用户名被设置为ftp。模块验证成功。在其它情况下,这个模块就会通过PAM_AUTHTOK选项返回 需要输入密码和验证失败的信息。

这个模块的行为可以使用如下参数修改:

debug

向syslog输出调试信息

users=xxx,yyy,….

使用等号之后给出的用户名代替ftp或者anonymous,作为匿名FTP的用户名。

ignore

不理会用户没有email地址。

示例和建议

在第四章中,有一个使用匿名FTP模块的例子。

6.8 组访问模块

6.8.1 概要

模块名

pam_group

作者

Andrew G. Morgan

维护者

作者

提供的管理组功能

suthentication

系统依赖性

需要/etc/security/group.conf文件。可以与libpwdb连接。

网络支持

只能通过正确设置PAM_TTY选项。

6.8.2 综述

这个模块根据用户名和发起服务请求的终端,提供组分类功能。

6.8.3 authentication组件

描述

这个模块不对用户进行验证,而是为用户赋予组成员关系。这种组成员关系是根据用户请求的服务划分的,在/etc/security/group.conf文件中以文本的方式设置。

示例和建议

想要这个模块正常工作,需要准确设置/etc/security/group.conf文件。其格式如下:

services; ttys; users; times; groups

前四项和pam_time配置文件:/etc/security/pam_time.conf或者time.conf中的相同。groups是一些以逗号或者空格分开的文本字符串,表示一些组名。如果用户的应用程序满足前四项,则用户就被加入到第五项定义的组中。

这个模块能否起作用取决于用户对文件系统的访问权限。这一点是指,一旦用户成为一个组的成员,这个用户就可能利用获得的权限试图建立一个 setgid程序。而以后,如果这个用户不再属于这个组,他就可以通过这个程序非法回到这个组中。由于这个原因,用户具有写权限的文件系统需要非常严格的 限制,如果文件系统在mount时,被设置为nosuid,那用户就无法建立和执行这样的程序。因此,使用这个模块时,用户具有写权限的所有文件系统都需 要使用nosuid参数mount。

pam_group的作用和/etc/group文件是并行的,如果用户被加入的这个模块定义的任何组中,同时也被加入到/etc/group文件中;反之亦然。

6.9 issue模块

6.9.1 概要

模块名

pam_issue

作者

Ben Collins

维护者

作者

提供的管理组功能

authentication(pam_sm_authenticate)

6.9.2 综述

这个模块能够在提示信息中,加入一个文件的内容。

6.9.3 authentication组件

能够识别的参数

issue=issue-file-name、noesc

描述

你可以使用这个模块在用户提示信息中加入一个issue文件的内容。这个模块还可以解析issue文件中的转义词,例如:x。

有效的转义码如下:

d: 当前的日期

s: 操作系统名

l: 这个终端名

m: 系统的体系(i686、spacr、pwerpc、….)

n: 系统主机名

o: 系统域名

r: 操作系统版本号

t: 当前时间

u: 当前登录的用户数

U: 和u相同,只有后缀有所不同:u的后缀是user;U的后缀是users。

v: 操作系统的版本/建立日期

这个模块的行为可以通过一下参数修改:

issue: 指定使用的文件

noesc: 关闭对转义词的解析

示例和建议

login auth pam_issue.so issue=/etc/issue

(作者:书生)

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