newusers [nouveaux_utilisateurs]

pw_passwd

Ce champ sera chiffré et utilisé comme la nouvelle valeur du mot de passe chiffré.

pw_gid

This field must contain the name (or number) of a group. The user will be added as a member to this group. When a non-existent group name or number is specified, a new group will be created. In the case of a non-existent group number, both the name and the number of the new group will be this number.

pw_dir

This field will be checked for existence as a directory, and a new directory with this name will be created if it does not already exist. The ownership of the directory will be set to be that of the user being created or updated.

Cette commande a été conçue pour les gros systèmes pour lesquels un grand nombre de comptes sont mis à jour à un même instant.  

Le fichier d'entrée doit être correctement protégé puisqu'il contient des mots de passe en clair.

PAM is not used to update the passwords. Only /etc/passwd and /etc/shadow are updated, and the various checks or options provided by PAM modules are not used.  

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

ENCRYPT_METHOD (string)

This defines the system default encryption algorithm for encrypting passwords (if no algorithm are specified on the command line).

It can take one of these values:

*DES (default)

*MD5

*SHA256

*SHA512

Note: this parameter overrides the MD5_CRYPT_ENAB variable.

Note: if you use PAM, it is recommended to set this variable consistently with the PAM modules configuration.

GID_MAX (number), GID_MIN (number)

Range of group IDs used for the creation of regular groups by useradd, useradd, or newusers.

MAX_MEMBERS_PER_GROUP (number)

Maximum members per group entry. When the maximum is reached, a new group entry (line) is started in /etc/group (with the same name, same password, and same GID).

The default value is 0, meaning that there are no limits in the number of members in a group.

This feature (split group) permits to limit the length of lines in the group file. This is useful to make sure that lines for NIS groups are not larger than 1024 characters.

If you need to enforce such limit, you can use 25.

Note: split groups may not be supported by all tools (even in the Shadow toolsuite. You should not use this variable unless you really need it.

MD5_CRYPT_ENAB (boolean)

Indicate if passwords must be encrypted using the MD5-based algorithm. If set to yes, new passwords will be encrypted using the MD5-based algorithm compatible with the one used by recent releases of FreeBSD. It supports passwords of unlimited length and longer salt strings. Set to no if you need to copy encrypted passwords to other systems which don't understand the new algorithm. Default is no.

This variable is superceded by the ENCRYPT_METHOD variable or by any command line option used to configure the encryption algorithm.

This variable is deprecated. You should use ENCRYPT_METHOD.

Note: if you use PAM, it is recommended to set this variable consistently with the PAM modules configuration.

PASS_MAX_DAYS (number)

Nombre maximum de jours de validité d'un mot de passe. Après cette durée, une modification du mot de passe est obligatoire. S'il n'est pas précisé, la valeur de -1 est utilisée (ce qui enlève toute restriction).

PASS_MIN_DAYS (number)

Nombre minimum de jours autorisé avant la modification d'un mot de passe. Toute tentative de modification du mot de passe avant cette durée est rejetée. S'il n'est pas précisé, la valeur de -1 est utilisée (ce qui enlève toute restriction).

PASS_WARN_AGE (number)

Nombre de jours durant lesquels l'utilisateur recevra un avertissement avant que son mot de passe n'arrive en fin de validité. Une valeur négative signifie qu'aucun avertissement n'est donné. S'il n'est pas précisé, aucun avertissement n'est donné.

SHA_CRYPT_MIN_ROUNDS (number), SHA_CRYPT_MAX_ROUNDS (number)

When ENCRYPT_METHOD is set to SHA256 or SHA512, this defines the number of SHA rounds used by the encryption algorithm by default (when the number of rounds is not specified on the command line).

With a lot of rounds, it is more difficult to brute forcing the password. But note also that more CPU resources will be needed to authenticate users.

If not specified, the libc will choose the default number of rounds (5000).

The values must be inside the 1000-999999999 range.

If only one of the SHA_CRYPT_MIN_ROUNDS or SHA_CRYPT_MAX_ROUNDS values is set, then this value will be used.

If SHA_CRYPT_MIN_ROUNDS > SHA_CRYPT_MAX_ROUNDS, the highest value will be used.

SYS_GID_MAX (number), SYS_GID_MIN (number)

Range of group IDs used for the creation of system groups by useradd, groupadd, or newusers.

SYS_UID_MAX (number), SYS_UID_MIN (number)

Range of user IDs used for the creation of system users by useradd or newusers.

UID_MAX (number), UID_MIN (number)

Range of user IDs used for the creation of regular users by useradd or newusers.

UMASK (number)

Valeur d'initialisation du masque de permissions. S'il n'est pas précisé, le masque des permissions sera initialisé à 022.

/etc/passwd

Informations sur les comptes des utilisateurs.

/etc/shadow

Informations sécurisées sur les comptes utilisateurs.

/etc/group

Informations sur les groupes.

/etc/gshadow

Informations sécurisées sur les groupes.

/etc/login.defs

Configuration de la suite des mots de passe cachés Fo shadow password Fc.

login.defs(5), passwd(1), useradd(8).

NOM

SYNOPSIS

DESCRIPTION

AVERTISSEMENTS

CONFIGURATION

FICHIERS

VOIR AUSSI