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.TH AUTHSRV 3
.SH NAME
authdial, passtokey, nvcsum, readnvram, convT2M, convM2T, convTR2M, convM2TR, convA2M, convM2A, convPR2M, convM2PR, _asgetticket, _asrdresp \- routines for communicating with authentication servers
.SH SYNOPSIS
.nf
.PP
.ft L
#include <u.h>
#include <libc.h>
#include <authsrv.h>
.fi
.ta 8n +4n +4n +4n +4n +4n +4n
.PP
.B
int authdial(char *netroot, char *ad);
.PP
.B
int passtokey(char key[DESKEYLEN], char *password)
.PP
.B
uchar nvcsum(void *mem, int len)
.PP
.B
int readnvram(Nvrsafe *nv, int flag);
.PPP
.B
int convT2M(Ticket *t, char *msg, char *key)
.PP
.B
void convM2T(char *msg, Ticket *t, char *key)
.PP
.B
int convA2M(Authenticator *a, char *msg, char *key)
.PP
.B
void convM2A(char *msg, Authenticator *a, char *key)
.PP
.B
int convTR2M(Ticketreq *tr, char *msg)
.PP
.B
void convM2TR(char *msg, Ticketreq *tr)
.PP
.B
int convPR2M(Passwordreq *pr, char *msg, char *key)
.PP
.B
void convM2PR(char *msg, Passwordreq *pr, char *key)
.PP
.B
int _asgetticket(int fd, char *trbuf, char *tbuf);
.PP
.B
int _asrdresp(int fd, char *buf, int len);
.SH DESCRIPTION
.PP
.I Authdial
dials an authentication server over the
network rooted at
.IR net ,
default
.BR /net .
The authentication domain,
.IR ad ,
specifies which server to call.
If
.I ad
is non-nil,
the network database
(see
.IM ndb (1) )
is queried for an entry which contains
.B authdom=\fIad\fP
or
.BR dom=\fIad\fP ,
the former having precedence,
and which also contains an
.B auth
attribute.
The string dialed is then
.I netroot\fP!\fIserver\fP!ticket
where
.I server
is the value of the
.B auth
attribute.
If no entry is found, the error string is
set to ``no authentication server found''
and -1 is returned.
If
.I authdom
is nil, the string
.IB netroot !$auth! ticket
is used to make the call.
.PP
.I Passtokey
converts
.I password
into a DES key and stores the result in
.IR key .
It returns 0 if
.I password
could not be converted,
and 1 otherwise.
.PP
.I Readnvram
reads authentication information into the structure:
.EX
.ta 4n +4n +8n +4n +4n +4n +4n
struct Nvrsafe
{
char machkey[DESKEYLEN];
uchar machsum;
char authkey[DESKEYLEN];
uchar authsum;
char config[CONFIGLEN];
uchar configsum;
char authid[ANAMELEN];
uchar authidsum;
char authdom[DOMLEN];
uchar authdomsum;
};
.EE
.PP
On Sparc, MIPS, and SGI machines this information is
in non-volatile ram, accessible in the file
.BR #r/nvram .
On x86s and Alphas
.I readnvram
successively opens the following areas stopping with the
first to succeed:
.PP
\- the partition named by the
.B $nvram
environment variable
.\" (commonly set via
.\" .IR plan9.ini (8))
.br
\- the partition
.B #S/sdC0/nvram
.br
\- a file called
.B plan9.nvr
in the partition
.B #S/sdC0/9fat
.br
\- the partition
.B #S/sd00/nvram
.br
\- a file called
.B plan9.nvr
in the partition
.B #S/sd00/9fat
.br
\- a file called
.B plan9.nvr
on a DOS floppy in drive 0
.br
\- a file called
.B plan9.nvr
on a DOS floppy in drive 1
.PP
The
.IR nvcsum s
of the fields
.BR machkey ,
.BR authid ,
and
.B authdom
must match their respective checksum or that field is zeroed.
If
.I flag
is
.B NVwrite
or at least one checksum fails and
.I flag
is
.BR NVwriteonerr ,
.I readnvram
will prompt for new values on
.B #c/cons
and then write them back to the storage area.
.PP
.IR ConvT2M ,
.IR convA2M ,
.IR convTR2M ,
and
.I convPR2M
convert tickets, authenticators, ticket requests, and password change request
structures into transmittable messages.
.IR ConvM2T ,
.IR convM2A ,
.IR convM2TR ,
and
.I convM2PR
are used to convert them back.
.I Key
is used for encrypting the message before transmission and decrypting
after reception.
.PP
The routine
.I _asgetresp
receives either a character array or an error string.
On error, it sets errstr and returns -1. If successful,
it returns the number of bytes received.
.PP
The routine
.I _asgetticket
sends a ticket request message and then uses
.I _asgetresp
to recieve an answer.
.SH SOURCE
.B \*9/src/libauthsrv
.SH SEE ALSO
.IM passwd (1) ,
.IM dial (3) ,
Plan 9's
.IR authsrv (6).
.SH DIAGNOSTICS
These routines set
.IR errstr .
Integer-valued functions return -1 on error.
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