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- #include <u.h>
- #include <libc.h>
- #include <authsrv.h>
- #include <fcall.h>
- #include <bio.h>
- #include <mp.h>
- #include <libsec.h>
- #include "authcmdlib.h"
- char authkey[8];
- typedef struct Fid Fid;
- typedef struct User User;
- enum{
- Qroot,
- Quser,
- Qkey,
- Qsecret,
- Qlog,
- Qstatus,
- Qexpire,
- Qwarnings,
- Qmax,
- Nuser = 512,
- MAXBAD = 10, /* max number of bad attempts before disabling the account */
- Namelen = ANAMELEN, /* file must be randomly addressible, so names have fixed length */
- };
- enum{
- Sok,
- Sdisabled,
- Smax,
- };
- struct Fid{
- int fid;
- ulong qtype;
- User *user;
- int busy;
- Fid *next;
- };
- struct User{
- char *name;
- char key[DESKEYLEN];
- char secret[SECRETLEN];
- ulong expire; /* 0 == never */
- uchar status;
- ulong bad; /* number of consecutive bad authentication attempts */
- int ref;
- char removed;
- uchar warnings;
- long purgatory; /* time purgatory ends */
- ulong uniq;
- User *link;
- };
- char *qinfo[Qmax] = {
- [Qroot] "keys",
- [Quser] ".",
- [Qkey] "key",
- [Qsecret] "secret",
- [Qlog] "log",
- [Qexpire] "expire",
- [Qstatus] "status",
- [Qwarnings] "warnings",
- };
- char *status[Smax] = {
- [Sok] "ok",
- [Sdisabled] "disabled",
- };
- Fid *fids;
- User *users[Nuser];
- char *userkeys;
- int nuser;
- ulong uniq = 1;
- Fcall rhdr,
- thdr;
- int usepass;
- char *warnarg;
- uchar mdata[8192 + IOHDRSZ];
- int messagesize = sizeof mdata;
- int readusers(void);
- ulong hash(char*);
- Fid *findfid(int);
- User *finduser(char*);
- User *installuser(char*);
- int removeuser(User*);
- void insertuser(User*);
- void writeusers(void);
- void io(int, int);
- void *emalloc(ulong);
- Qid mkqid(User*, ulong);
- int dostat(User*, ulong, void*, int);
- int newkeys(void);
- void warning(void);
- char *Auth(Fid*), *Attach(Fid*), *Version(Fid*),
- *Flush(Fid*), *Walk(Fid*),
- *Open(Fid*), *Create(Fid*),
- *Read(Fid *), *Write(Fid*), *Clunk(Fid*),
- *Remove(Fid *), *Stat(Fid*), *Wstat(Fid*);
- char *(*fcalls[])(Fid*) = {
- [Tattach] Attach,
- [Tauth] Auth,
- [Tclunk] Clunk,
- [Tcreate] Create,
- [Tflush] Flush,
- [Topen] Open,
- [Tread] Read,
- [Tremove] Remove,
- [Tstat] Stat,
- [Tversion] Version,
- [Twalk] Walk,
- [Twrite] Write,
- [Twstat] Wstat,
- };
- void
- main(int argc, char *argv[])
- {
- char *mntpt;
- int p[2];
- mntpt = "/mnt/keys";
- ARGBEGIN{
- case 'm':
- mntpt = ARGF();
- break;
- case 'w':
- warnarg = ARGF();
- break;
- case 'p':
- usepass = 1;
- break;
- }ARGEND
- argv0 = "keyfs";
- userkeys = "/adm/keys";
- if(argc > 0)
- userkeys = argv[0];
- if(pipe(p) < 0)
- error("can't make pipe: %r");
- if(usepass) {
- getpass(authkey, nil, 0, 0);
- } else {
- if(!getauthkey(authkey))
- print("keyfs: warning: can't read /dev/key\n");
- }
- switch(rfork(RFPROC|RFNAMEG|RFNOTEG|RFNOWAIT|RFENVG|RFFDG)){
- case 0:
- close(p[0]);
- io(p[1], p[1]);
- exits(0);
- case -1:
- error("fork");
- default:
- close(p[1]);
- if(mount(p[0], -1, mntpt, MREPL|MCREATE, "") < 0)
- error("can't mount: %r");
- exits(0);
- }
- }
- char *
- Flush(Fid *f)
- {
- USED(f);
- return 0;
- }
- char *
- Auth(Fid *)
- {
- return "keyfs: authentication not required";
- }
- char *
- Attach(Fid *f)
- {
- if(f->busy)
- Clunk(f);
- f->user = 0;
- f->qtype = Qroot;
- f->busy = 1;
- thdr.qid = mkqid(f->user, f->qtype);
- return 0;
- }
- char*
- Version(Fid*)
- {
- Fid *f;
- for(f = fids; f; f = f->next)
- if(f->busy)
- Clunk(f);
- if(rhdr.msize > sizeof mdata)
- thdr.msize = sizeof mdata;
- else
- thdr.msize = rhdr.msize;
- messagesize = thdr.msize;
- if(strncmp(rhdr.version, "9P2000", 6) != 0)
- return "bad 9P version";
- thdr.version = "9P2000";
- return 0;
- }
- char *
- Walk(Fid *f)
- {
- char *name, *err;
- int i, j, max;
- Fid *nf;
- ulong qtype;
- User *user;
- if(!f->busy)
- return "walk of unused fid";
- nf = nil;
- qtype = f->qtype;
- user = f->user;
- if(rhdr.fid != rhdr.newfid){
- nf = findfid(rhdr.newfid);
- if(nf->busy)
- return "fid in use";
- f = nf; /* walk f */
- }
- err = nil;
- i = 0;
- if(rhdr.nwname > 0){
- for(; i<rhdr.nwname; i++){
- if(i >= MAXWELEM){
- err = "too many path name elements";
- break;
- }
- name = rhdr.wname[i];
- switch(qtype){
- case Qroot:
- if(strcmp(name, "..") == 0)
- goto Accept;
- user = finduser(name);
- if(!user)
- goto Out;
- qtype = Quser;
- Accept:
- thdr.wqid[i] = mkqid(user, qtype);
- break;
- case Quser:
- if(strcmp(name, "..") == 0) {
- qtype = Qroot;
- user = 0;
- goto Accept;
- }
- max = Qmax;
- for(j = Quser + 1; j < Qmax; j++)
- if(strcmp(name, qinfo[j]) == 0){
- qtype = j;
- break;
- }
- if(j < max)
- goto Accept;
- goto Out;
- default:
- err = "file is not a directory";
- goto Out;
- }
- }
- Out:
- if(i < rhdr.nwname && err == nil)
- err = "file not found";
- }
- if(err != nil){
- return err;
- }
- /* if we cloned and then completed the walk, update new fid */
- if(rhdr.fid != rhdr.newfid && i == rhdr.nwname){
- nf->busy = 1;
- nf->qtype = qtype;
- if(nf->user = user)
- nf->user->ref++;
- }else if(nf == nil && rhdr.nwname > 0){ /* walk without clone (rare) */
- Clunk(f);
- f->busy = 1;
- f->qtype = qtype;
- if(f->user = user)
- f->user->ref++;
- }
- thdr.nwqid = i;
- return 0;
- }
- char *
- Clunk(Fid *f)
- {
- f->busy = 0;
- if(f->user && --f->user->ref == 0 && f->user->removed) {
- free(f->user->name);
- free(f->user);
- }
- f->user = 0;
- return 0;
- }
- char *
- Open(Fid *f)
- {
- int mode;
- if(!f->busy)
- return "open of unused fid";
- mode = rhdr.mode;
- if(f->qtype == Quser && (mode & (OWRITE|OTRUNC)))
- return "user already exists";
- thdr.qid = mkqid(f->user, f->qtype);
- thdr.iounit = messagesize - IOHDRSZ;
- return 0;
- }
- char *
- Create(Fid *f)
- {
- char *name;
- long perm;
- if(!f->busy)
- return "create of unused fid";
- name = rhdr.name;
- if(f->user){
- return "permission denied";
- }else{
- perm = rhdr.perm;
- if(!(perm & DMDIR))
- return "permission denied";
- if(strcmp(name, "") == 0)
- return "empty file name";
- if(strlen(name) >= Namelen)
- return "file name too long";
- if(finduser(name))
- return "user already exists";
- f->user = installuser(name);
- f->user->ref++;
- f->qtype = Quser;
- }
- thdr.qid = mkqid(f->user, f->qtype);
- thdr.iounit = messagesize - IOHDRSZ;
- writeusers();
- return 0;
- }
- char *
- Read(Fid *f)
- {
- User *u;
- char *data;
- ulong off, n, m;
- int i, j, max;
- if(!f->busy)
- return "read of unused fid";
- n = rhdr.count;
- off = rhdr.offset;
- thdr.count = 0;
- data = thdr.data;
- switch(f->qtype){
- case Qroot:
- j = 0;
- for(i = 0; i < Nuser; i++)
- for(u = users[i]; u; j += m, u = u->link){
- m = dostat(u, Quser, data, n);
- if(m <= BIT16SZ)
- break;
- if(j < off)
- continue;
- data += m;
- n -= m;
- }
- thdr.count = data - thdr.data;
- return 0;
- case Quser:
- max = Qmax;
- max -= Quser + 1;
- j = 0;
- for(i = 0; i < max; j += m, i++){
- m = dostat(f->user, i + Quser + 1, data, n);
- if(m <= BIT16SZ)
- break;
- if(j < off)
- continue;
- data += m;
- n -= m;
- }
- thdr.count = data - thdr.data;
- return 0;
- case Qkey:
- if(f->user->status != Sok)
- return "user disabled";
- if(f->user->purgatory > time(0))
- return "user in purgatory";
- if(f->user->expire != 0 && f->user->expire < time(0))
- return "user expired";
- if(off != 0)
- return 0;
- if(n > DESKEYLEN)
- n = DESKEYLEN;
- memmove(thdr.data, f->user->key, n);
- thdr.count = n;
- return 0;
- case Qsecret:
- if(f->user->status != Sok)
- return "user disabled";
- if(f->user->purgatory > time(0))
- return "user in purgatory";
- if(f->user->expire != 0 && f->user->expire < time(0))
- return "user expired";
- if(off != 0)
- return 0;
- if(n > strlen(f->user->secret))
- n = strlen(f->user->secret);
- memmove(thdr.data, f->user->secret, n);
- thdr.count = n;
- return 0;
- case Qstatus:
- if(off != 0){
- thdr.count = 0;
- return 0;
- }
- if(f->user->status == Sok && f->user->expire && f->user->expire < time(0))
- sprint(thdr.data, "expired\n");
- else
- sprint(thdr.data, "%s\n", status[f->user->status]);
- thdr.count = strlen(thdr.data);
- return 0;
- case Qexpire:
- if(off != 0){
- thdr.count = 0;
- return 0;
- }
- if(!f->user->expire)
- strcpy(data, "never\n");
- else
- sprint(data, "%lud\n", f->user->expire);
- if(n > strlen(data))
- n = strlen(data);
- thdr.count = n;
- return 0;
- case Qlog:
- if(off != 0){
- thdr.count = 0;
- return 0;
- }
- sprint(data, "%lud\n", f->user->bad);
- if(n > strlen(data))
- n = strlen(data);
- thdr.count = n;
- return 0;
- case Qwarnings:
- if(off != 0){
- thdr.count = 0;
- return 0;
- }
- sprint(data, "%ud\n", f->user->warnings);
- if(n > strlen(data))
- n = strlen(data);
- thdr.count = n;
- return 0;
- default:
- return "permission denied: unknown qid";
- }
- }
- char *
- Write(Fid *f)
- {
- char *data, *p;
- ulong n, expire;
- int i;
- if(!f->busy)
- return "permission denied";
- n = rhdr.count;
- data = rhdr.data;
- switch(f->qtype){
- case Qkey:
- if(n != DESKEYLEN)
- return "garbled write data";
- memmove(f->user->key, data, DESKEYLEN);
- thdr.count = DESKEYLEN;
- break;
- case Qsecret:
- if(n >= SECRETLEN)
- return "garbled write data";
- memmove(f->user->secret, data, n);
- f->user->secret[n] = 0;
- thdr.count = n;
- break;
- case Qstatus:
- data[n] = '\0';
- if(p = strchr(data, '\n'))
- *p = '\0';
- for(i = 0; i < Smax; i++)
- if(strcmp(data, status[i]) == 0){
- f->user->status = i;
- break;
- }
- if(i == Smax)
- return "unknown status";
- f->user->bad = 0;
- thdr.count = n;
- break;
- case Qexpire:
- data[n] = '\0';
- if(p = strchr(data, '\n'))
- *p = '\0';
- else
- p = &data[n];
- if(strcmp(data, "never") == 0)
- expire = 0;
- else{
- expire = strtoul(data, &data, 10);
- if(data != p)
- return "bad expiration date";
- }
- f->user->expire = expire;
- f->user->warnings = 0;
- thdr.count = n;
- break;
- case Qlog:
- data[n] = '\0';
- if(strcmp(data, "good") == 0)
- f->user->bad = 0;
- else
- f->user->bad++;
- if(f->user->bad && ((f->user->bad)%MAXBAD) == 0)
- f->user->purgatory = time(0) + f->user->bad;
- return 0;
- case Qwarnings:
- data[n] = '\0';
- f->user->warnings = strtoul(data, 0, 10);
- thdr.count = n;
- break;
- case Qroot:
- case Quser:
- default:
- return "permission denied";
- }
- writeusers();
- return 0;
- }
- char *
- Remove(Fid *f)
- {
- if(!f->busy)
- return "permission denied";
- if(f->qtype == Qwarnings)
- f->user->warnings = 0;
- else if(f->qtype == Quser)
- removeuser(f->user);
- else {
- Clunk(f);
- return "permission denied";
- }
- Clunk(f);
- writeusers();
- return 0;
- }
- char *
- Stat(Fid *f)
- {
- static uchar statbuf[1024];
- if(!f->busy)
- return "stat on unattached fid";
- thdr.nstat = dostat(f->user, f->qtype, statbuf, sizeof statbuf);
- if(thdr.nstat <= BIT16SZ)
- return "stat buffer too small";
- thdr.stat = statbuf;
- return 0;
- }
- char *
- Wstat(Fid *f)
- {
- Dir d;
- int n;
- char buf[1024];
- if(!f->busy || f->qtype != Quser)
- return "permission denied";
- if(rhdr.nstat > sizeof buf)
- return "wstat buffer too big";
- if(convM2D(rhdr.stat, rhdr.nstat, &d, buf) == 0)
- return "bad stat buffer";
- n = strlen(d.name);
- if(n == 0 || n >= Namelen)
- return "bad user name";
- if(finduser(d.name))
- return "user already exists";
- if(!removeuser(f->user))
- return "user previously removed";
- free(f->user->name);
- f->user->name = strdup(d.name);
- if(f->user->name == nil)
- error("wstat: malloc failed: %r");
- insertuser(f->user);
- writeusers();
- return 0;
- }
- Qid
- mkqid(User *u, ulong qtype)
- {
- Qid q;
- q.vers = 0;
- q.path = qtype;
- if(u)
- q.path |= u->uniq * 0x100;
- if(qtype == Quser || qtype == Qroot)
- q.type = QTDIR;
- else
- q.type = QTFILE;
- return q;
- }
- int
- dostat(User *user, ulong qtype, void *p, int n)
- {
- Dir d;
- if(qtype == Quser)
- d.name = user->name;
- else
- d.name = qinfo[qtype];
- d.uid = d.gid = d.muid = "auth";
- d.qid = mkqid(user, qtype);
- if(d.qid.type & QTDIR)
- d.mode = 0777|DMDIR;
- else
- d.mode = 0666;
- d.atime = d.mtime = time(0);
- d.length = 0;
- return convD2M(&d, p, n);
- }
- int
- passline(Biobuf *b, void *vbuf)
- {
- char *buf = vbuf;
- if(Bread(b, buf, KEYDBLEN) != KEYDBLEN)
- return 0;
- decrypt(authkey, buf, KEYDBLEN);
- buf[Namelen-1] = '\0';
- return 1;
- }
- void
- randombytes(uchar *p, int len)
- {
- int i, fd;
- fd = open("/dev/random", OREAD);
- if(fd < 0){
- fprint(2, "keyfs: can't open /dev/random, using rand()\n");
- srand(time(0));
- for(i = 0; i < len; i++)
- p[i] = rand();
- return;
- }
- read(fd, p, len);
- close(fd);
- }
- void
- oldCBCencrypt(char *key7, uchar *p, int len)
- {
- uchar ivec[8];
- uchar key[8];
- DESstate s;
- memset(ivec, 0, 8);
- des56to64((uchar*)key7, key);
- setupDESstate(&s, key, ivec);
- desCBCencrypt((uchar*)p, len, &s);
- }
- void
- oldCBCdecrypt(char *key7, uchar *p, int len)
- {
- uchar ivec[8];
- uchar key[8];
- DESstate s;
- memset(ivec, 0, 8);
- des56to64((uchar*)key7, key);
- setupDESstate(&s, key, ivec);
- desCBCdecrypt((uchar*)p, len, &s);
- }
- void
- writeusers(void)
- {
- int fd, i, nu;
- User *u;
- uchar *p, *buf;
- ulong expire;
- /* count users */
- nu = 0;
- for(i = 0; i < Nuser; i++)
- for(u = users[i]; u; u = u->link)
- nu++;
- /* pack into buffer */
- buf = malloc(KEYDBOFF + nu*KEYDBLEN);
- if(buf == 0){
- fprint(2, "keyfs: can't write keys file, out of memory\n");
- return;
- }
- p = buf;
- randombytes(p, KEYDBOFF);
- p += KEYDBOFF;
- for(i = 0; i < Nuser; i++)
- for(u = users[i]; u; u = u->link){
- strncpy((char*)p, u->name, Namelen);
- p += Namelen;
- memmove(p, u->key, DESKEYLEN);
- p += DESKEYLEN;
- *p++ = u->status;
- *p++ = u->warnings;
- expire = u->expire;
- *p++ = expire;
- *p++ = expire >> 8;
- *p++ = expire >> 16;
- *p++ = expire >> 24;
- memmove(p, u->secret, SECRETLEN);
- p += SECRETLEN;
- }
- /* encrypt */
- oldCBCencrypt(authkey, buf, p - buf);
- /* write file */
- fd = create(userkeys, OWRITE, 0660);
- if(fd < 0){
- free(buf);
- fprint(2, "keyfs: can't write keys file\n");
- return;
- }
- if(write(fd, buf, p - buf) != (p - buf))
- fprint(2, "keyfs: can't write keys file\n");
- free(buf);
- close(fd);
- }
- int
- readusers(void)
- {
- int fd, i, n, nu;
- uchar *p, *buf, *ep;
- User *u;
- Dir *d;
- /* read file into an array */
- fd = open(userkeys, OREAD);
- if(fd < 0)
- return 0;
- d = dirfstat(fd);
- if(d == nil){
- close(fd);
- return 0;
- }
- buf = malloc(d->length);
- if(buf == 0){
- close(fd);
- free(d);
- return 0;
- }
- n = readn(fd, buf, d->length);
- close(fd);
- free(d);
- if(n != d->length){
- free(buf);
- return 0;
- }
- /* decrypt */
- n -= n % KEYDBLEN;
- oldCBCdecrypt(authkey, buf, n);
- /* unpack */
- nu = 0;
- for(i = KEYDBOFF; i < n; i += KEYDBLEN){
- ep = buf + i;
- u = finduser((char*)ep);
- if(u == 0)
- u = installuser((char*)ep);
- memmove(u->key, ep + Namelen, DESKEYLEN);
- p = ep + Namelen + DESKEYLEN;
- u->status = *p++;
- u->warnings = *p++;
- if(u->status >= Smax)
- fprint(2, "keyfs: warning: bad status in key file\n");
- u->expire = p[0] + (p[1]<<8) + (p[2]<<16) + (p[3]<<24);
- p += 4;
- memmove(u->secret, p, SECRETLEN);
- u->secret[SECRETLEN-1] = 0;
- nu++;
- }
- free(buf);
- print("%d keys read\n", nu);
- return 1;
- }
- User *
- installuser(char *name)
- {
- User *u;
- int h;
- h = hash(name);
- u = emalloc(sizeof *u);
- u->name = strdup(name);
- if(u->name == nil)
- error("malloc failed: %r");
- u->removed = 0;
- u->ref = 0;
- u->purgatory = 0;
- u->expire = 0;
- u->status = Sok;
- u->bad = 0;
- u->warnings = 0;
- u->uniq = uniq++;
- u->link = users[h];
- users[h] = u;
- return u;
- }
- User *
- finduser(char *name)
- {
- User *u;
- for(u = users[hash(name)]; u; u = u->link)
- if(strcmp(name, u->name) == 0)
- return u;
- return 0;
- }
- int
- removeuser(User *user)
- {
- User *u, **last;
- char *name;
- user->removed = 1;
- name = user->name;
- last = &users[hash(name)];
- for(u = *last; u; u = *last){
- if(strcmp(name, u->name) == 0){
- *last = u->link;
- return 1;
- }
- last = &u->link;
- }
- return 0;
- }
- void
- insertuser(User *user)
- {
- int h;
- user->removed = 0;
- h = hash(user->name);
- user->link = users[h];
- users[h] = user;
- }
- ulong
- hash(char *s)
- {
- ulong h;
- h = 0;
- while(*s)
- h = (h << 1) ^ *s++;
- return h % Nuser;
- }
- Fid *
- findfid(int fid)
- {
- Fid *f, *ff;
- ff = 0;
- for(f = fids; f; f = f->next)
- if(f->fid == fid)
- return f;
- else if(!ff && !f->busy)
- ff = f;
- if(ff){
- ff->fid = fid;
- return ff;
- }
- f = emalloc(sizeof *f);
- f->fid = fid;
- f->busy = 0;
- f->user = 0;
- f->next = fids;
- fids = f;
- return f;
- }
- void
- io(int in, int out)
- {
- char *err;
- int n;
- long now, lastwarning;
- /* after restart, let the system settle for 5 mins before warning */
- lastwarning = time(0) - 24*60*60 + 5*60;
- for(;;){
- n = read9pmsg(in, mdata, messagesize);
- if(n == 0)
- continue;
- if(n < 0)
- error("mount read %d", n);
- if(convM2S(mdata, n, &rhdr) == 0)
- continue;
- if(newkeys())
- readusers();
- thdr.data = (char*)mdata + IOHDRSZ;
- thdr.fid = rhdr.fid;
- if(!fcalls[rhdr.type])
- err = "fcall request";
- else
- err = (*fcalls[rhdr.type])(findfid(rhdr.fid));
- thdr.tag = rhdr.tag;
- thdr.type = rhdr.type+1;
- if(err){
- thdr.type = Rerror;
- thdr.ename = err;
- }
- n = convS2M(&thdr, mdata, messagesize);
- if(write(out, mdata, n) != n)
- error("mount write");
- now = time(0);
- if(warnarg && (now - lastwarning > 24*60*60)){
- syslog(0, "auth", "keyfs starting warnings: %lux %lux", now, lastwarning);
- warning();
- lastwarning = now;
- }
- }
- }
- int
- newkeys(void)
- {
- Dir *d;
- static long ftime;
- d = dirstat(userkeys);
- if(d == nil)
- return 0;
- if(d->mtime > ftime){
- ftime = d->mtime;
- free(d);
- return 1;
- }
- free(d);
- return 0;
- }
- void *
- emalloc(ulong n)
- {
- void *p;
- if(p = malloc(n))
- return p;
- error("out of memory");
- return 0; /* not reached */
- }
- void
- warning(void)
- {
- int i;
- char buf[64];
- snprint(buf, sizeof buf, "-%s", warnarg);
- switch(rfork(RFPROC|RFNAMEG|RFNOTEG|RFNOWAIT|RFENVG|RFFDG)){
- case 0:
- i = open("/sys/log/auth", OWRITE);
- if(i >= 0){
- dup(i, 2);
- seek(2, 0, 2);
- close(i);
- }
- execl("/bin/auth/warning", "warning", warnarg, nil);
- error("can't exec warning");
- }
- }
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