ref: 3efb5bbb4061056e523858b134c555949591efe2
dir: /man/1/passwd/
.TH PASSWD 1 .SH NAME passwd \- change user password .SH SYNOPSIS .B auth/passwd [ .BI -u " user" ] [ .BI -s " signer" ] [ .I keyfile ] .SH DESCRIPTION .I Passwd changes the secret shared between the invoker and the authentication server .I signer (default: .BR $SIGNER ). The .I signer must offer the .IR keysrv (4) service. .PP The secret is associated with a remote user name that need not be the same as the name of the invoking user on the local system. That remote user name is specified by a certificate signed by .IR signer , and obtained from .IR keyfile . .I Keyfile identifies a file containing a certificate (default: .LR default ). If .I keyfile is not an absolute pathname, the file used will be .BI /usr/ user /keyring/ keyfile. .I User by default is the invoking user's name (read from .BR /dev/user ), but the .B -u option can name another. .PP .I Passwd connects to the .IR signer , authenticating using the certificate in .IR keyfile , and checks that the user in the certificate is registered there with an existing secret. .I Passwd then prompts for the (remote) user's old secret, to double-check identity, then prompts for a new one, which must be confirmed. .PP Secrets must be at least eight characters long. Try to make them hard to guess. .SH FILES .TF /mnt/keysrv .TP .B /dev/user current user name .TP .B /mnt/keysrv local mount point for connection to remote .IR keysrv (4) .SH SOURCE .B /appl/cmd/auth/passwd.b .SH SEE ALSO .IR keyfs (4), .IR keysrv (4), .IR changelogin (8), .IR logind (8)