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- /*
- * This file is part of the UCB release of Plan 9. It is subject to the license
- * terms in the LICENSE file found in the top-level directory of this
- * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
- * part of the UCB release of Plan 9, including this file, may be copied,
- * modified, propagated, or distributed except according to the terms contained
- * in the LICENSE file.
- */
- #include "all.h"
- #include "io.h"
- #include <authsrv.h>
- Nvrsafe nvr;
- static int gotnvr; /* flag: nvr contains nvram; it could be bad */
- char*
- nvrgetconfig(void)
- {
- return conf.confdev;
- }
- /*
- * we shouldn't be writing nvram any more.
- * the secstore/config field is now just secstore key.
- * we still use authid, authdom and machkey for authentication.
- */
- int
- nvrcheck(void)
- {
- uint8_t csum;
- if (readnvram(&nvr, NVread) < 0) {
- print("nvrcheck: can't read nvram\n");
- return 1;
- } else
- gotnvr = 1;
- print("nvr read\n");
- csum = nvcsum(nvr.machkey, sizeof nvr.machkey);
- if(csum != nvr.machsum) {
- print("\n\n ** NVR key checksum is incorrect **\n");
- print(" ** set password to allow attaches **\n\n");
- memset(nvr.machkey, 0, sizeof nvr.machkey);
- return 1;
- }
- return 0;
- }
- int
- nvrsetconfig(char* word)
- {
- /* config block is on device `word' */
- USED(word);
- return 0;
- }
- int
- conslock(void)
- {
- char *ln;
- char nkey1[DESKEYLEN];
- static char zeroes[DESKEYLEN];
- if(memcmp(nvr.machkey, zeroes, DESKEYLEN) == 0) {
- print("no password set\n");
- return 0;
- }
- for(;;) {
- print("%s password:", service);
- /* could turn off echo here */
- if ((ln = Brdline(&bin, '\n')) == nil)
- return 0;
- ln[Blinelen(&bin)-1] = '\0';
- /* could turn on echo here */
- memset(nkey1, 0, DESKEYLEN);
- passtokey(nkey1, ln);
- if(memcmp(nkey1, nvr.machkey, DESKEYLEN) == 0) {
- prdate();
- break;
- }
- print("Bad password\n");
- delay(1000);
- }
- return 1;
- }
- /*
- * authentication specific to 9P2000
- */
- /* authentication states */
- enum
- {
- HaveProtos=1,
- NeedProto,
- HaveOK,
- NeedCchal,
- HaveSinfo,
- NeedTicket,
- HaveSauthenticator,
- SSuccess,
- };
- char *phasename[] =
- {
- [HaveProtos] "HaveProtos",
- [NeedProto] "NeedProto",
- [HaveOK] "HaveOK",
- [NeedCchal] "NeedCchal",
- [HaveSinfo] "HaveSinfo",
- [NeedTicket] "NeedTicket",
- [HaveSauthenticator] "HaveSauthenticator",
- [SSuccess] "SSuccess",
- };
- /* authentication structure */
- struct Auth
- {
- int inuse;
- char uname[NAMELEN]; /* requestor's remote user name */
- char aname[NAMELEN]; /* requested aname */
- Userid uid; /* uid decided on */
- int phase;
- char cchal[CHALLEN];
- char tbuf[TICKETLEN+AUTHENTLEN]; /* server ticket */
- Ticket t;
- Ticketreq tr;
- };
- Auth* auths;
- Lock authlock;
- void
- authinit(void)
- {
- auths = malloc(conf.nauth * sizeof(*auths));
- }
- static int
- failure(Auth *s, char *why)
- {
- int i;
- if(*why)print("authentication failed: %s: %s\n", phasename[s->phase], why);
- srand((uintptr)s + time(nil));
- for(i = 0; i < CHALLEN; i++)
- s->tr.chal[i] = nrand(256);
- s->uid = -1;
- strncpy(s->tr.authid, nvr.authid, NAMELEN);
- strncpy(s->tr.authdom, nvr.authdom, DOMLEN);
- memmove(s->cchal, s->tr.chal, sizeof(s->cchal));
- s->phase = HaveProtos;
- return -1;
- }
- Auth*
- authnew(char *uname, char *aname)
- {
- static int si = 0;
- int i, nwrap;
- Auth *s;
- i = si;
- nwrap = 0;
- for(;;){
- if(i < 0 || i >= conf.nauth){
- if(++nwrap > 1)
- return nil;
- i = 0;
- }
- s = &auths[i++];
- if(s->inuse)
- continue;
- lock(&authlock);
- if(s->inuse == 0){
- s->inuse = 1;
- strncpy(s->uname, uname, NAMELEN-1);
- strncpy(s->aname, aname, NAMELEN-1);
- failure(s, "");
- si = i;
- unlock(&authlock);
- break;
- }
- unlock(&authlock);
- }
- return s;
- }
- void
- authfree(Auth *s)
- {
- if(s != nil)
- s->inuse = 0;
- }
- int
- authread(File* file, uint8_t* data, int n)
- {
- Auth *s;
- int m;
- s = file->auth;
- if(s == nil)
- return -1;
- switch(s->phase){
- default:
- return failure(s, "unexpected phase");
- case HaveProtos:
- m = snprint((char*)data, n, "v.2 p9sk1@%s", nvr.authdom) + 1;
- s->phase = NeedProto;
- break;
- case HaveOK:
- m = 3;
- if(n < m)
- return failure(s, "read too short");
- strcpy((char*)data, "OK");
- s->phase = NeedCchal;
- break;
- case HaveSinfo:
- m = TICKREQLEN;
- if(n < m)
- return failure(s, "read too short");
- convTR2M(&s->tr, (char*)data);
- s->phase = NeedTicket;
- break;
- case HaveSauthenticator:
- m = AUTHENTLEN;
- if(n < m)
- return failure(s, "read too short");
- memmove(data, s->tbuf+TICKETLEN, m);
- s->phase = SSuccess;
- break;
- }
- return m;
- }
- int
- authwrite(File* file, uint8_t *data, int n)
- {
- Auth *s;
- int m;
- char *p, *d;
- Authenticator a;
- s = file->auth;
- if(s == nil)
- return -1;
- switch(s->phase){
- default:
- return failure(s, "unknown phase");
- case NeedProto:
- p = (char*)data;
- if(p[n-1] != 0)
- return failure(s, "proto missing terminator");
- d = strchr(p, ' ');
- if(d == nil)
- return failure(s, "proto missing separator");
- *d++ = 0;
- if(strcmp(p, "p9sk1") != 0)
- return failure(s, "unknown proto");
- if(strcmp(d, nvr.authdom) != 0)
- return failure(s, "unknown domain");
- s->phase = HaveOK;
- m = n;
- break;
- case NeedCchal:
- m = CHALLEN;
- if(n < m)
- return failure(s, "client challenge too short");
- memmove(s->cchal, data, sizeof(s->cchal));
- s->phase = HaveSinfo;
- break;
- case NeedTicket:
- m = TICKETLEN+AUTHENTLEN;
- if(n < m)
- return failure(s, "ticket+auth too short");
- convM2T((char*)data, &s->t, nvr.machkey);
- if(s->t.num != AuthTs
- || memcmp(s->t.chal, s->tr.chal, sizeof(s->t.chal)) != 0)
- return failure(s, "bad ticket");
- convM2A((char*)data+TICKETLEN, &a, s->t.key);
- if(a.num != AuthAc
- || memcmp(a.chal, s->tr.chal, sizeof(a.chal)) != 0
- || a.id != 0)
- return failure(s, "bad authenticator");
- /* at this point, we're convinced */
- s->uid = strtouid(s->t.suid);
- if(s->uid < 0)
- return failure(s, "unknown user");
- if(cons.flags & authdebugflag)
- print("user %s = %d authenticated\n",
- s->t.suid, s->uid);
- /* create an authenticator to send back */
- a.num = AuthAs;
- memmove(a.chal, s->cchal, sizeof(a.chal));
- a.id = 0;
- convA2M(&a, s->tbuf+TICKETLEN, s->t.key);
- s->phase = HaveSauthenticator;
- break;
- }
- return m;
- }
- int
- authuid(Auth* s)
- {
- return s->uid;
- }
- char*
- authaname(Auth* s)
- {
- return s->aname;
- }
- char*
- authuname(Auth* s)
- {
- return s->uname;
- }
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