ref: cd747191012d0420ac631340d962da1f80cef0a5
dir: /sys/man/2/authsrv/
.TH AUTHSRV 2
.SH NAME
authdial, passtokey, nvcsum, readnvram, convT2M, convM2T, convTR2M, convM2TR, convA2M, convM2A, convPR2M, convM2PR, _asgetticket, _asrequest, _asgetresp, _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
void passtokey(Authkey *key, 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, int len, Authkey *key)
.PP
.B
int convM2T(char *msg, int len, Ticket *t, Authkey *key)
.PP
.B
int convA2M(Authenticator *a, char *msg, int len, Ticket *t)
.PP
.B
int convM2A(char *msg, int len, Authenticator *a, Ticket *t)
.PP
.B
int convTR2M(Ticketreq *tr, char *msg, int len)
.PP
.B
int convM2TR(char *msg, int len, Ticketreq *tr)
.PP
.B
int convPR2M(Passwordreq *pr, char *msg, int len, Ticket *t)
.PP
.B
int convM2PR(char *msg, int len, Passwordreq *pr, Ticket *t)
.PP
.B
int _asgetticket(int fd, Ticketreq *tr, char *buf, int len)
.PP
.B
int _asrequest(int fd, Ticketreq *tr)
.PP
.B
int _asgetresp(int fd, Ticket *t, Authenticator *a, Authkey *key)
.PP
.B
int _asrdresp(int fd, char *buf, int len)
.SH DESCRIPTION
.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 connection server
.B cs
(see
.IR ndb (8))
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.
If it finds neither, it tries
.BI p9auth. ad
in DNS as the authentication server.
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 set of cryptographic keys and stores them in the
.I Authkey
structure
.IR key .
.PP
.I Readnvram
reads authentication information into the structure:
.PP
.EX
.ta 4n +4n +8n +4n +4n +4n +4n
struct Nvrsafe
{
char machkey[DESKEYLEN]; /* was file server's authid's des key */
uchar machsum;
char authkey[DESKEYLEN]; /* authid's des key from password */
uchar authsum;
/*
* file server config string of device holding full configuration;
* secstore key on non-file-servers.
*/
char config[CONFIGLEN];
uchar configsum;
char authid[ANAMELEN]; /* auth userid, e.g., bootes */
uchar authidsum;
char authdom[DOMLEN]; /* auth domain, e.g., cs.bell-labs.com */
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.
If
.I flag
is
.BR NVwritemem ,
.I readnvram
will write the values in
.I *nv
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.
.IR ConvA2M ,
.IR convM2A ,
.I convPR2M
and
.I convM2PR
encrypt/decrypt the message with the random ticket key.
.PP
The routine
.I _asgetticket
sends a ticket request
.I tr
returning the two encrypted tickets in
.IR buf .
The routine
.I _asrequest
encodes the ticket request
.I tr
and sends it not waiting for a response.
After sending a request,
.I _asgetresp
can be used to receive the response containing a ticket and an optional
authenticator and decrypts the ticket and authenticator using
.IR key .
The routine
.I _asrdresp
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.
.SH SOURCE
.B /sys/src/libauthsrv
.SH SEE ALSO
.IR passwd (1),
.IR cons (3),
.IR dial (2),
.IR authsrv (6),
.SH DIAGNOSTICS
These routines set
.IR errstr .
Integer-valued functions return -1 on error.