AUTH(2)

NAME

auth, srvauth, getchall, challreply, newns, authdial, passtokey, nvcsum − network authentication

SYNOPSIS

#include <u.h>
#include <libc.h>
#include <auth.h>

char∗auth(int fd, char ∗dialstring)

char∗srvauth(char ∗user)

intgetchall(char ∗user, char chall[NETCHLEN]);

intchallreply(int fd, char ∗user, char ∗response);

char∗newns(char ∗user, char ∗nsfile)

intauthdial(char ∗service)

intpasstokey(char key[DESKEYLEN], char ∗password)

ucharnvcsum(void ∗mem, int len)

DESCRIPTION

Auth and srvauth authenticate connections for Plan 9 remote execution using the rexauth protocol described in auth(6). Auth authenticates an outgoing network call. Fd is a file descriptor to the data channel of the network connection. Auth extracts from dialstring the name of the server being called. Dialstring should be the address passed to dial(2). Auth reads the user’s name with getuser(2) and uses #c/crypt for encrypting and decrypting rexauth messages.

Srvauth authenticates the corresponding incoming call. It copies the name of the user into user, which must be at least NAMELEN bytes long.

Getchall and challreply authenticate an incoming network call for a service that does not perform the usual Plan 9 authentication. They use the chal protocol described in auth(6). User points to the local name of the user. Getchall reads a null-terminated textual challenge from the authentication server and copies it to chall. It returns the open file descriptor to the authentication server, or −1 if it fails. The challenge should be printed for the user to see, and the user should use a Digital Pathways Securenet Key or aux/netkey (see passwd(1)) to generate the appropriate response.

Challreply should be called with the user’s response, which is also a null-terminated text string, and the file descriptor returned from getchall. It returns 0 if it succeeds, or −1 if the user was not authenticated.

Srvauth and challreply set the process’s user name and encryption key (see cons(3)).

Newns builds a name space for user. It opens the file nsfile (/lib/namespace is used if nsfile is null), copies the old environment, and erases the current name space, sets the environment variables user and home, and interprets the commands in nsfile. The format of nsfile is described in namespace(6).

Authdial calls service on the local authentication server. It returns a file descriptor to the open connection or −1 if it fails.

Passtokey converts password into a DES key and stores the result in key. It returns 0 if password could not be converted, and 1 otherwise.

Nvcsum computes a checksum for the len byte array mem. It is used to checksum keys stored in non-volatile RAM.

FILES

#c/crypt Encryption file used by auth.

/lib/namespace Default name space specification file.

DIAGNOSTICS

Auth, srvauth, and newns return a pointer to an error message upon failure, and 0 upon success.

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