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#pragma src "/sys/src/libauthsrv"
#pragma lib "libauthsrv.a"
/*
* Interface for talking to authentication server.
*/
typedef struct Ticket Ticket;
typedef struct Ticketreq Ticketreq;
typedef struct Authenticator Authenticator;
typedef struct Nvrsafe Nvrsafe;
typedef struct Passwordreq Passwordreq;
typedef struct OChapreply OChapreply;
typedef struct OMSchapreply OMSchapreply;
typedef struct Authkey Authkey;
enum
{
ANAMELEN= 28, /* name max size in previous proto */
AERRLEN= 64, /* errstr max size in previous proto */
DOMLEN= 48, /* authentication domain name length */
DESKEYLEN= 7, /* encrypt/decrypt des key length */
AESKEYLEN= 16, /* encrypt/decrypt aes key length */
CHALLEN= 8, /* plan9 sk1 challenge length */
NETCHLEN= 16, /* max network challenge length (used in AS protocol) */
CONFIGLEN= 14,
SECRETLEN= 32, /* secret max size */
PASSWDLEN= 28, /* password max size */
NONCELEN= 32,
KEYDBOFF= 8, /* bytes of random data at key file's start */
OKEYDBLEN= ANAMELEN+DESKEYLEN+4+2, /* old key file entry length */
KEYDBLEN= OKEYDBLEN+SECRETLEN, /* key file entry length */
OMD5LEN= 16,
/* AuthPAK constants */
PAKKEYLEN= 32,
PAKSLEN= (448+7)/8, /* ed448 scalar */
PAKPLEN= 4*PAKSLEN, /* point in extended format X,Y,Z,T */
PAKHASHLEN= 2*PAKPLEN, /* hashed points PM,PN */
PAKXLEN= PAKSLEN, /* random scalar secret key */
PAKYLEN= PAKSLEN, /* decaf encoded public key */
};
/* encryption numberings (anti-replay) */
enum
{
AuthTreq=1, /* ticket request */
AuthChal=2, /* challenge box request */
AuthPass=3, /* change password */
AuthOK=4, /* fixed length reply follows */
AuthErr=5, /* error follows */
AuthMod=6, /* modify user */
AuthApop=7, /* apop authentication for pop3 */
AuthOKvar=9, /* variable length reply follows */
AuthChap=10, /* chap authentication for ppp */
AuthMSchap=11, /* MS chap authentication for ppp */
AuthCram=12, /* CRAM verification for IMAP (RFC2195 & rfc2104) */
AuthHttp=13, /* http domain login */
AuthVNC=14, /* VNC server login (deprecated) */
AuthPAK=19, /* authenticated diffie hellman key agreement */
AuthMSchapv2=21,/* MS chap v2 authentication for ppp */
AuthTs=64, /* ticket encrypted with server's key */
AuthTc, /* ticket encrypted with client's key */
AuthAs, /* server generated authenticator */
AuthAc, /* client generated authenticator */
AuthTp, /* ticket encrypted with client's key for password change */
AuthHr, /* http reply */
};
struct Ticketreq
{
char type;
char authid[ANAMELEN]; /* server's encryption id */
char authdom[DOMLEN]; /* server's authentication domain */
char chal[CHALLEN]; /* challenge from server */
char hostid[ANAMELEN]; /* host's encryption id */
char uid[ANAMELEN]; /* uid of requesting user on host */
};
#define TICKREQLEN (3*ANAMELEN+CHALLEN+DOMLEN+1)
struct Ticket
{
char num; /* replay protection */
char chal[CHALLEN]; /* server challenge */
char cuid[ANAMELEN]; /* uid on client */
char suid[ANAMELEN]; /* uid on server */
uchar key[NONCELEN]; /* nonce key */
char form; /* (not transmitted) format (0 = des, 1 = ccpoly) */
};
#define MAXTICKETLEN (12+CHALLEN+2*ANAMELEN+NONCELEN+16)
struct Authenticator
{
char num; /* replay protection */
char chal[CHALLEN]; /* server/client challenge */
uchar rand[NONCELEN]; /* server/client nonce */
};
#define MAXAUTHENTLEN (12+CHALLEN+NONCELEN+16)
struct Passwordreq
{
char num;
char old[PASSWDLEN];
char new[PASSWDLEN];
char changesecret;
char secret[SECRETLEN]; /* new secret */
};
#define MAXPASSREQLEN (12+2*PASSWDLEN+1+SECRETLEN+16)
struct OChapreply
{
uchar id;
char uid[ANAMELEN];
char resp[OMD5LEN];
};
#define OCHAPREPLYLEN (1+ANAMELEN+OMD5LEN)
struct OMSchapreply
{
char uid[ANAMELEN];
char LMresp[24]; /* Lan Manager response */
char NTresp[24]; /* NT response */
};
#define OMSCHAPREPLYLEN (ANAMELEN+24+24)
struct Authkey
{
char des[DESKEYLEN]; /* DES key from password */
uchar aes[AESKEYLEN]; /* AES key from password */
uchar pakkey[PAKKEYLEN]; /* shared key from AuthPAK exchange (see authpak_finish()) */
uchar pakhash[PAKHASHLEN]; /* secret hash from AES key and user name (see authpak_hash()) */
};
/*
* convert to/from wire format
*/
extern int convT2M(Ticket*, char*, int, Authkey*);
extern int convM2T(char*, int, Ticket*, Authkey*);
extern int convA2M(Authenticator*, char*, int, Ticket*);
extern int convM2A(char*, int, Authenticator*, Ticket*);
extern int convTR2M(Ticketreq*, char*, int);
extern int convM2TR(char*, int, Ticketreq*);
extern int convPR2M(Passwordreq*, char*, int, Ticket*);
extern int convM2PR(char*, int, Passwordreq*, Ticket*);
/*
* convert ascii password to auth key
*/
extern void passtokey(Authkey*, char*);
extern void passtodeskey(char key[DESKEYLEN], char *p);
extern void passtoaeskey(uchar key[AESKEYLEN], char *p);
/*
* Nvram interface
*/
enum {
NVread = 0, /* just read */
NVwrite = 1<<0, /* always prompt and rewrite nvram */
NVwriteonerr = 1<<1, /* prompt and rewrite nvram when corrupt */
NVwritemem = 1<<2, /* don't prompt, write nvram from argument */
};
/* storage layout */
struct Nvrsafe
{
char machkey[DESKEYLEN]; /* 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;
uchar aesmachkey[AESKEYLEN];
uchar aesmachsum;
};
extern uchar nvcsum(void*, int);
extern int readnvram(Nvrsafe*, int);
extern char* readcons(char*, char*, int);
/*
* call up auth server
*/
extern int authdial(char *netroot, char *authdom);
/*
* exchange messages with auth server
*/
extern int _asgetpakkey(int, Ticketreq*, Authkey*);
extern int _asgetticket(int, Ticketreq*, char*, int);
extern int _asrequest(int, Ticketreq*);
extern int _asgetresp(int, Ticket*, Authenticator*, Authkey *);
extern int _asrdresp(int, char*, int);
/*
* AuthPAK protocol
*/
typedef struct PAKpriv PAKpriv;
struct PAKpriv
{
int isclient;
uchar x[PAKXLEN];
uchar y[PAKYLEN];
};
extern void authpak_hash(Authkey *k, char *u);
extern void authpak_new(PAKpriv *p, Authkey *k, uchar y[PAKYLEN], int isclient);
extern int authpak_finish(PAKpriv *p, Authkey *k, uchar y[PAKYLEN]);
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