authsrv(3) - Plan 9 from User Space

| AUTHSRV(3) | AUTHSRV(3)
| NAME
| authdial, passtokey, nvcsum, readnvram, convT2M, convM2T, convTR2M, convM2TR, convA2M, convM2A, convPR2M, convM2PR, _asgetticket, _asrdresp – routines for communicating with authentication servers
SYNOPSIS
| `#include <u.h> #include <libc.h> #include <authsrv.h>
int authdial(char *netroot, char *ad);
` `int passtokey(char key[DESKEYLEN], char *password)
` `uchar nvcsum(void *mem, int len)
` `int readnvram(Nvrsafe *nv, int flag);
` `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)
` `int _asgetticket(int fd, char *trbuf, char *tbuf);
` `int _asrdresp(int fd, char *buf, int len);`
DESCRIPTION
| Authdial dials an authentication server over the network rooted at net, default `/net`. The authentication domain, ad, specifies which server to call. If ad is non-nil, the network database (see ndb(1)) is queried for an entry which contains `authdom=`ad or `dom=`ad, the former having precedence, and which also contains an `auth` attribute. The string dialed is then netroot!server!ticket where server is the value of the `auth` attribute. If no entry is found, the error string is set to “no authentication server found” and -1 is returned. If authdom is nil, the string netroot`!$auth!` ticket is used to make the call.
Passtokey converts password into a DES key and stores the result in key. It returns 0 if password could not be converted, and 1 otherwise.
Readnvram reads authentication information into the structure:
| `struct Nvrsafe {
| char machkey[DESKEYLEN]; uchar machsum; char authkey[DESKEYLEN]; uchar authsum; char config[CONFIGLEN]; uchar configsum; char authid[ANAMELEN]; uchar authidsum; char authdom[DOMLEN]; uchar authdomsum;
};
`
On Sparc, MIPS, and SGI machines this information is in non-volatile ram, accessible in the file `#r/nvram`. On x86s and Alphas readnvram successively opens the following areas stopping with the first to succeed:
– the partition named by the `$nvram` environment variable – the partition `#S/sdC0/nvram` – a file called `plan9.nvr` in the partition `#S/sdC0/9fat` – the partition `#S/sd00/nvram` – a file called `plan9.nvr` in the partition `#S/sd00/9fat` – a file called `plan9.nvr` on a DOS floppy in drive 0 – a file called `plan9.nvr` on a DOS floppy in drive 1
The nvcsums of the fields `machkey`, `authid`, and `authdom` must match their respective checksum or that field is zeroed. If flag is `NVwrite` or at least one checksum fails and flag is `NVwriteonerr`, readnvram will prompt for new values on `#c/cons` and then write them back to the storage area.
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.
The routine _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.
The routine _asgetticket sends a ticket request message and then uses _asgetresp to recieve an answer.
SOURCE
| `/usr/lib/plan9/src/libauthsrv`
SEE ALSO
| passwd(1), dial(3), Plan 9’s authsrv(6).
DIAGNOSTICS
| These routines set errstr. Integer-valued functions return -1 on error.