名称

chgpasswd - 批量更新组密码

大纲

chgpasswd [options]

描述

The chgpasswd command reads a list of group name and password pairs from standard input and uses this information to update a set of existing groups. Each line is of the format:

group_name:password

By default the supplied password must be in clear-text, and is encrypted by chgpasswd.

The default encryption algorithm can be defined for the system with the ENCRYPT_METHOD variable of /etc/login.defs, and can be overwritten with the -e, -m, or -c options.

此命令一般用于需要一次创建很多用户的大型系统。

选项

The options which apply to the chgpasswd command are:

-c, --crypt-method

使用指定的方法加密密码。

The available methods are DES, MD5, SHA256, SHA512, YESCRYPT and NONE if your libc supports these methods.

-e, --encrypted

提供的密码是已经加密了的

-h, --help

显示帮助信息并退出。

-m, --md5

如果提供的密码没有加密，则使用 MD5 加密而不是 DES。

-R, --root CHROOT_DIR

Apply changes in the CHROOT_DIR directory and use the configuration files from the CHROOT_DIR directory. Only absolute paths are supported.

-s, --sha-rounds

使用指定次数的轮转来加密密码。

You can only use this option with crypt method: SHA256 SHA512 YESCRYPT

By default, the number of rounds for SHA256 or SHA512 is defined by the SHA_CRYPT_MIN_ROUNDS and SHA_CRYPT_MAX_ROUNDS variables in /etc/login.defs.

A minimal value of 1000 and a maximal value of 999,999,999 will be enforced for SHA256 and SHA512. The default number of rounds is 5000.

By default, the number of rounds for YESCRYPT is defined by the YESCRYPT_COST_FACTOR in /etc/login.defs.

A minimal value of 1 and a maximal value of 11 will be enforced for YESCRYPT. The default number of rounds is 5.

CAVEATS

记住要设置权限或者掩码来阻止其它用户对未加密文件的读取。

您需要确保你吗和加密方法符合系统的密码策略。

配置文件

The following configuration variables in /etc/login.defs change the behavior of this tool:

文件

/etc/group

组账户信息。

/etc/gshadow

安全组账户信息。

/etc/login.defs

Shadow 密码套件配置。

参见

gpasswd(1), groupadd(8), login.defs(5).

2024-04-01

shadow-utils 4.15.1