AUTH(2) AUTH(2)
NAME
auth, amount, srvauth, authnonce, srvauthnonce,
authenticate, getchal, chalreply, vncchal, vncreply,
apopchal, apopreply, cramchal, cramreply, newns, addns,
authdial, passtokey, nvcsum, convT2M, convM2T, convTR2M,
convM2TR, convA2M, convM2A, convPR2M, convM2PR, login,
httpauth, noworld - network authentication
SYNOPSIS
#include <u.h>
#include <libc.h>
#include <auth.h>
int auth(int fd)
int srvauth(int fd, char *user)
int authnonce(int fd, uchar nonce[8])
int srvauthnonce(int fd, char *user, uchar nonce[8])
int getchal(Chalstate *c, char *user)
int chalreply(Chalstate *c, char *response)
int vncchal(VNCchalstate *c, char *user)
int vncreply(VNCchalstate *c, uchar *response)
int apopchal(Apopchalstate *c, char *user)
int apopreply(Apopchalstate *c, char *response)
int cramchal(Cramchalstate *c, char *user)
int cramreply(Cramchalstate *c, char *response)
int newns(char *user, char *nsfile)
int addns(char *user, char *nsfile)
int authdial(char *service)
int passtokey(char key[DESKEYLEN], char *password)
uchar nvcsum(void *mem, int len)
int authenticate(int fd, int afd)
int amount(int fd, char *old, int flag, char *aname)
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AUTH(2) AUTH(2)
int convT2M(Ticket *t, char *msg, char *key)
void convM2T(char *msg, Ticket *t, char *key)
int convA2M(Authenticator *a, char *msg, char *key)
void convM2A(char *msg, Authenticator *a, char *key)
int convTR2M(Ticketreq *tr, char *msg)
void convM2TR(char *msg, Ticketreq *tr)
int convPR2M(Passwordreq *pr, char *msg, char *key)
void convM2PR(char *msg, Passwordreq *pr, char *key)
void login(char *user, char *password, char *namespace)
int httpauth(char *realm, char *password);
int noworld(char *user);
DESCRIPTION
These functions perform the authentication protocol as
described in auth(6) for programs such as cpu(1), import(4),
etc.
Auth and srvauth authenticate connections for Plan 9 remote
execution using the rexauth protocol described in auth(6).
Auth is run by the caller and srvauth by the server; both
return 0 if successful and -1 on error. Fd is a file
descriptor to the data channel.
Srvauth authenticates the corresponding incoming call. It
copies the name of the user into user, which must be at
least NAMELEN bytes long.
Authnonce and srvauthnonce are versions of auth and srvauth
that return an 8 byte nonce key. The key is a DES key and
hence has only 56 bits of random data, the other 8 being
parity bits.
Getchal and chalreply authenticate an incoming network call
for a service that does not perform the usual Plan 9 authen-
tication. They use the chal protocol described in auth(6).
User points to the local name of the user. Getchal reads a
null-terminated textual challenge from the authentication
server and copies it to c->chal. It returns 0 if it reaches
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 netkey (see
passwd(1)) to generate the appropriate response.
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Chalreply should be called with the user's response, which
is also a null-terminated text string. It returns 0 if it
succeeds, or -1 if the user was not authenticated.
Vncchal, vncreply, apopchal, apopreply, cramchal, and
cramreply are similar to getchal and chalreply and are used
much the same way. The only differences are when the user
name is known (before or after the challenge) and the format
of the challenges and replies. They negotiate the
challenge/reply protocols for VNC, APOP (RFC1939), and CRAM
(RFC2195) authentication. They use the user's APOP secret
which is different than his Plan 9 password or SecureNet
Key.
Srvauth, chalreply, vncreply, apopreply, and cramreply set
the process's user name (see cons(3)).
Vncchal and vncreply depend on changes currently being
requested for the VNC authentication protocol. Thus, they
may be subject to change once the protocol is tied down.
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 com-
mands in nsfile. The format of nsfile is described in
namespace(6).
Addns also interprets and executes the commands in nsfile.
Unlike newns is applies the command to the current name
space rather than starting from scratch.
Authdial calls service on the local authentication server.
It returns a file descriptor to the open connection or -1 if
it fails. Authdial is used to implement many of the other
functions here; it is not normally called by users.
Passtokey converts password into a DES key and stores the
result in key. It returns 0 if password could not be con-
verted, and 1 otherwise.
Nvcsum computes a checksum for the len byte array mem. It is
used to checksum keys stored in non-volatile RAM.
Authenticate performs authentication to a file server at the
other end of the channel referenced by fd. If afd is greater
than or equal to zero and the authentication requires call-
ing the authentication server then afd is used as a channel
to it. Otherwise, authenticate dials the authentication
server using authdial().
Amount is like mount but performs authentication on fd. It
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AUTH(2) AUTH(2)
should be used instead of mount whenever the file server
being mounted requires authentication. See bind(2) for a
definition of the arguments to mount and amount.
ConvT2M, convA2M, convTR2M, and convPR2M convert tickets,
authenticators, ticket requests, and password change request
structures into transmittable messages. ConvM2T, convM2A,
convM2TR, and convM2PR are used to convert them back. Key
is used for encrypting the message before transmission and
decrypting after reception. These routines are used by the
others to communicate with the authentication server.
Login changes the the account the process is running as to
user and recreates the namespace using the file namespace
(default /lib/namespace). It does this by negotiating with
the authentication server using password to encrypt the
exchange.
Httpauth check a password for an HTTP page. The realm iden-
tifies the password to check for. Like login, it does this
by negotiating with the authentication server using password
to encrypt the exchange. Httpauth returns 0 on success and
-1 on failure.
Noworld returns 1 if the user is in the group noworld in
/adm/users. Otherwise, it returns 0.
FILES
/lib/namespace Default name space specification file.
SOURCE
/sys/src/libauth
SEE ALSO
passwd(1), auth(6), cons(3), dial(2), auth(8)
DIAGNOSTICS
These routines set errstr. Integer-valued functions return
-1 on error.
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