table of contents
CHGPASSWD(8) | System Management Commands | CHGPASSWD(8) |
NOM¶
chgpasswd - Mettre à jour par lot des mots de passe des groupes
SYNOPSIS¶
chgpasswd [options]
DESCRIPTION¶
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.
Cette commande est destinée aux gros systèmes pour lesquels un nombre importants de comptes sont créés en une seule fois.
OPTIONS¶
The options which apply to the chgpasswd command are:
-c, --crypt-method
The available methods are DES, MD5, SHA256, SHA512, YESCRYPT and NONE if your libc supports these methods.
-e, --encrypted
-h, --help
-m, --md5
-R, --root CHROOT_DIR
-s, --sha-rounds
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.
AVERTISSEMENTS¶
Pensez à configurer les permissions ou umask afin d'empêcher la lecture des fichiers non chiffrés par les d'autres utilisateurs.
Vous devez vous assurer que les mots de passe et la méthode de chiffrement respectent la politique de mot de passe du système.
CONFIGURATION¶
The following configuration variables in /etc/login.defs change the behavior of this tool:
FICHIERS¶
/etc/group
/etc/gshadow
/etc/login.defs
VOIR AUSSI¶
05/08/2024 | shadow-utils 4.16.0 |