mirror of
https://github.com/9fans/plan9port.git
synced 2025-01-12 11:10:07 +00:00
factotum: implement p9cr
This commit is contained in:
Russ Cox
parent
ec9247088b
commit
d96dce4d87
3 changed files with 202 additions and 369 deletions
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@ -7,6 +7,7 @@ PROTO=\
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dsa.$O\
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httpdigest.$O\
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p9any.$O\
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p9cr.$O\
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p9sk1.$O\
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pass.$O\
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rsa.$O\
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@ -1,5 +1,5 @@
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/*
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* p9cr, vnc - one-sided challenge/response authentication
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* p9cr - one-sided challenge/response authentication
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*
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* Protocol:
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*
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@ -17,17 +17,50 @@
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#include "std.h"
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#include "dat.h"
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/* shared with auth dialing routines */
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typedef struct ServerState ServerState;
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struct ServerState
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{
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int asfd;
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Key *k;
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Ticketreq tr;
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Ticket t;
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char *dom;
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char *hostid;
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};
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enum
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{
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MAXCHAL = 64,
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MAXRESP = 64,
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};
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extern Proto p9cr, vnc;
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static int p9response(char*, uchar*, uchar*);
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// static int vncresponse(char*, uchar*, uchar*);
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static int p9crchal(ServerState *s, int, char*, uchar*, int);
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static int p9crresp(ServerState*, uchar*, int);
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static int
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p9crcheck(Key *k)
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{
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if(!strfindattr(k->attr, "user") || !strfindattr(k->privattr, "!password")){
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werrstr("need user and !password attributes");
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return -1;
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}
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return 0;
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}
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static int
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p9crclient(Conv *c)
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{
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char *chal, *pw, *res, *user;
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int astype, nchal, npw, ntry, ret;
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uchar resp[MD5dlen];
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char *pw, *res, *user;
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int astype, challen, resplen, ntry, ret;
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Attr *attr;
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DigestState *ds;
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Key *k;
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chal = nil;
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uchar chal[MAXCHAL+1], resp[MAXRESP];
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int (*response)(char*, uchar*, uchar*);
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k = nil;
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res = nil;
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ret = -1;
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@ -36,9 +69,12 @@ p9crclient(Conv *c)
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if(c->proto == &p9cr){
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astype = AuthChal;
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challen = NETCHLEN;
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response = p9response;
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attr = _mkattr(AttrNameval, "proto", "p9sk1", _delattr(_copyattr(attr), "proto"));
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}else if(c->proto == &vnc){
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astype = AuthVnc;
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astype = AuthVNC;
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challen = MAXCHAL;
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// response = vncresponse;
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}else{
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werrstr("bad proto");
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goto out;
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@ -53,12 +89,11 @@ p9crclient(Conv *c)
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if(c->attr != attr)
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freeattr(c->attr);
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c->attr = addattrs(copyattr(attr), k->attr);
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if((pw = strfindattr(k->privattr, "!password")) == nil){
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werrstr("key has no !password (cannot happen)");
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goto out;
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}
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npw = strlen(pw);
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if((user = strfindattr(k->attr, "user")) == nil){
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werrstr("key has no user (cannot happen)");
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goto out;
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@ -67,13 +102,14 @@ p9crclient(Conv *c)
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if(convprint(c, "%s", user) < 0)
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goto out;
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if(convreadm(c, &chal) < 0)
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if(convread(c, chal, challen) < 0)
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goto out;
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chal[challen] = 0;
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if((resplen = (*response)(pw, chal, resp)) < 0)
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goto out;
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if((nresp = (*response)(chal, resp)) < 0)
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goto out;
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if(convwrite(c, resp, nresp) < 0)
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if(convwrite(c, resp, resplen) < 0)
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goto out;
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if(convreadm(c, &res) < 0)
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@ -94,7 +130,6 @@ p9crclient(Conv *c)
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out:
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keyclose(k);
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free(chal);
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if(c->attr != attr)
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freeattr(attr);
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return ret;
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@ -103,11 +138,11 @@ out:
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static int
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p9crserver(Conv *c)
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{
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char chal[MAXCHAL], *user, *resp;
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int astype, challen, asfd, fd, ret;
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uchar chal[MAXCHAL], *resp, *resp1;
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char *user;
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ServerState s;
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int astype, ret, challen, resplen;
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Attr *a;
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Key *k;
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char *hostid, *dom;
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ret = -1;
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user = nil;
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@ -119,7 +154,7 @@ p9crserver(Conv *c)
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astype = AuthChal;
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challen = NETCHLEN;
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}else if(c->proto == &vnc){
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astype = AuthVnc;
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astype = AuthVNC;
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challen = MAXCHAL;
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}else{
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werrstr("bad proto");
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@ -127,44 +162,55 @@ p9crserver(Conv *c)
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}
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c->state = "find key";
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if((k = plan9authkey(c->attr)) == nil)
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if((s.k = plan9authkey(c->attr)) == nil)
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goto out;
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/*
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a = copyattr(k->attr);
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a = copyattr(s.k->attr);
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a = delattr(a, "proto");
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c->attr = addattrs(c->attr, a);
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freeattr(a);
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*/
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c->state = "authdial";
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hostid = strfindattr(s.k->attr, "user");
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dom = strfindattr(s.k->attr, "dom");
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if((asfd = xioauthdial(nil, s.dom)) < 0){
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s.hostid = strfindattr(s.k->attr, "user");
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s.dom = strfindattr(s.k->attr, "dom");
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if((s.asfd = xioauthdial(nil, s.dom)) < 0){
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werrstr("authdial %s: %r", s.dom);
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goto out;
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}
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c->state = "authchal";
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if(p9crchal(&s, astype, chal) < 0)
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goto out;
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c->state = "write challenge";
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if(convprint(c, "%s", chal) < 0)
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goto out;
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for(;;){
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c->state = "read user";
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if(convreadm(c, &user) < 0)
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goto out;
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c->state = "read response";
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if(convreadm(c, &resp) < 0)
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c->state = "authchal";
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if(p9crchal(&s, astype, user, chal, challen) < 0)
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goto out;
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c->state = "write challenge";
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if(convwrite(c, chal, challen) < 0)
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goto out;
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c->state = "read response";
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if((resplen = convreadm(c, (char**)(void*)&resp)) < 0)
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goto out;
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if(c->proto == &p9cr){
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if(resplen > NETCHLEN){
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convprint(c, "bad response too long");
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goto out;
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}
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resp1 = emalloc(NETCHLEN);
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memset(resp1, 0, NETCHLEN);
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memmove(resp1, resp, resplen);
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free(resp);
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resp = resp1;
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resplen = NETCHLEN;
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}
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c->state = "authwrite";
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switch(apopresp(&s, user, resp)){
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switch(p9crresp(&s, resp, resplen)){
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case -1:
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fprint(2, "p9crresp: %r\n");
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goto out;
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case 0:
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c->state = "write status";
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@ -195,346 +241,130 @@ out:
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return ret;
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}
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enum
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{
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MAXCHAL = 64
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};
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typedef struct State State;
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struct State
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{
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Key *key;
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int astype;
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int asfd;
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Ticket t;
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Ticketreq tr;
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char chal[MAXCHAL];
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int challen;
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char resp[MAXCHAL];
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int resplen;
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};
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enum
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{
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CNeedChal,
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CHaveResp,
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SHaveChal,
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SNeedResp,
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Maxphase
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};
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static char *phasenames[Maxphase] =
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{
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[CNeedChal] "CNeedChal",
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[CHaveResp] "CHaveResp",
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[SHaveChal] "SHaveChal",
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[SNeedResp] "SNeedResp"
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};
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static void
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p9crclose(Fsstate *fss)
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{
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State *s;
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s = fss->ps;
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if(s->asfd >= 0){
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close(s->asfd);
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s->asfd = -1;
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}
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free(s);
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}
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static int getchal(State*, Fsstate*);
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static int
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p9crinit(Proto *p, Fsstate *fss)
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{
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int iscli, ret;
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char *user;
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State *s;
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Attr *attr;
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if((iscli = isclient(_str_findattr(fss->attr, "role"))) < 0)
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return failure(fss, nil);
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s = emalloc(sizeof(*s));
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s->asfd = -1;
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if(p == &p9cr){
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s->astype = AuthChal;
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s->challen = NETCHLEN;
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}else if(p == &vnc){
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s->astype = AuthVNC;
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s->challen = Maxchal;
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}else
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abort();
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if(iscli){
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fss->phase = CNeedChal;
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if(p == &p9cr)
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attr = setattr(_copyattr(fss->attr), "proto=p9sk1");
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else
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attr = nil;
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ret = findkey(&s->key, fss, Kuser, 0, attr ? attr : fss->attr,
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"role=client %s", p->keyprompt);
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_freeattr(attr);
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if(ret != RpcOk){
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free(s);
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return ret;
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}
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fss->ps = s;
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}else{
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if((ret = findp9authkey(&s->key, fss)) != RpcOk){
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free(s);
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return ret;
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}
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if((user = _str_findattr(fss->attr, "user")) == nil){
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free(s);
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return failure(fss, "no user name specified in start msg");
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}
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if(strlen(user) >= sizeof s->tr.uid){
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free(s);
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return failure(fss, "user name too long");
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}
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fss->ps = s;
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strcpy(s->tr.uid, user);
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ret = getchal(s, fss);
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if(ret != RpcOk){
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p9crclose(fss); /* frees s */
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fss->ps = nil;
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}
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}
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fss->phasename = phasenames;
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fss->maxphase = Maxphase;
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return ret;
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}
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static int
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p9crread(Fsstate *fss, void *va, uint *n)
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{
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int m;
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State *s;
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s = fss->ps;
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switch(fss->phase){
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default:
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return phaseerror(fss, "read");
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case CHaveResp:
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if(s->resplen < *n)
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*n = s->resplen;
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memmove(va, s->resp, *n);
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fss->phase = Established;
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return RpcOk;
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case SHaveChal:
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if(s->astype == AuthChal)
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m = strlen(s->chal); /* ascii string */
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else
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m = s->challen; /* fixed length binary */
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if(m > *n)
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return toosmall(fss, m);
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*n = m;
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memmove(va, s->chal, m);
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fss->phase = SNeedResp;
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return RpcOk;
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}
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}
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static int
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p9response(Fsstate *fss, State *s)
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{
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char key[DESKEYLEN];
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uchar buf[8];
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ulong chal;
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char *pw;
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pw = _str_findattr(s->key->privattr, "!password");
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if(pw == nil)
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return failure(fss, "vncresponse cannot happen");
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passtokey(key, pw);
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memset(buf, 0, 8);
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sprint((char*)buf, "%d", atoi(s->chal));
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if(encrypt(key, buf, 8) < 0)
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return failure(fss, "can't encrypt response");
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chal = (buf[0]<<24)+(buf[1]<<16)+(buf[2]<<8)+buf[3];
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s->resplen = snprint(s->resp, sizeof s->resp, "%.8lux", chal);
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return RpcOk;
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}
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static uchar tab[256];
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/* VNC reverses the bits of each byte before using as a des key */
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static void
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mktab(void)
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{
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int i, j, k;
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static int once;
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if(once)
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return;
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once = 1;
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for(i=0; i<256; i++) {
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j=i;
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tab[i] = 0;
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for(k=0; k<8; k++) {
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tab[i] = (tab[i]<<1) | (j&1);
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j >>= 1;
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}
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}
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}
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static int
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vncaddkey(Key *k)
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{
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uchar *p;
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char *s;
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k->priv = emalloc(8+1);
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if(s = _str_findattr(k->privattr, "!password")){
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mktab();
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memset(k->priv, 0, 8+1);
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strncpy((char*)k->priv, s, 8);
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for(p=k->priv; *p; p++)
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*p = tab[*p];
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}else{
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werrstr("no key data");
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return -1;
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}
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return replacekey(k);
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}
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static void
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vncclosekey(Key *k)
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{
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free(k->priv);
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}
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static int
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vncresponse(Fsstate*, State *s)
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{
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DESstate des;
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memmove(s->resp, s->chal, sizeof s->chal);
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setupDESstate(&des, s->key->priv, nil);
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desECBencrypt((uchar*)s->resp, s->challen, &des);
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s->resplen = s->challen;
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return RpcOk;
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}
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static int
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p9crwrite(Fsstate *fss, void *va, uint n)
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{
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char tbuf[TICKETLEN+AUTHENTLEN];
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State *s;
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char *data = va;
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Authenticator a;
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char resp[Maxchal];
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int ret;
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s = fss->ps;
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switch(fss->phase){
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default:
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return phaseerror(fss, "write");
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case CNeedChal:
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if(n >= sizeof(s->chal))
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return failure(fss, Ebadarg);
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memset(s->chal, 0, sizeof s->chal);
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memmove(s->chal, data, n);
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s->challen = n;
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if(s->astype == AuthChal)
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ret = p9response(fss, s);
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else
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ret = vncresponse(fss, s);
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if(ret != RpcOk)
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return ret;
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fss->phase = CHaveResp;
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return RpcOk;
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|
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case SNeedResp:
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/* send response to auth server and get ticket */
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if(n > sizeof(resp))
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return failure(fss, Ebadarg);
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memset(resp, 0, sizeof resp);
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memmove(resp, data, n);
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if(write(s->asfd, resp, s->challen) != s->challen)
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return failure(fss, Easproto);
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/* get ticket plus authenticator from auth server */
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if(_asrdresp(s->asfd, tbuf, TICKETLEN+AUTHENTLEN) < 0)
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return failure(fss, nil);
|
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/* check ticket */
|
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convM2T(tbuf, &s->t, s->key->priv);
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if(s->t.num != AuthTs
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|| memcmp(s->t.chal, s->tr.chal, sizeof(s->t.chal)) != 0)
|
||||
return failure(fss, Easproto);
|
||||
convM2A(tbuf+TICKETLEN, &a, s->t.key);
|
||||
if(a.num != AuthAc
|
||||
|| memcmp(a.chal, s->tr.chal, sizeof(a.chal)) != 0
|
||||
|| a.id != 0)
|
||||
return failure(fss, Easproto);
|
||||
|
||||
fss->haveai = 1;
|
||||
fss->ai.cuid = s->t.cuid;
|
||||
fss->ai.suid = s->t.suid;
|
||||
fss->ai.nsecret = 0;
|
||||
fss->ai.secret = nil;
|
||||
fss->phase = Established;
|
||||
return RpcOk;
|
||||
}
|
||||
}
|
||||
|
||||
static int
|
||||
getchal(State *s, Fsstate *fss)
|
||||
p9crchal(ServerState *s, int astype, char *user, uchar *chal, int challen)
|
||||
{
|
||||
char trbuf[TICKREQLEN];
|
||||
Ticketreq tr;
|
||||
int n;
|
||||
|
||||
safecpy(s->tr.hostid, _str_findattr(s->key->attr, "user"), sizeof(s->tr.hostid));
|
||||
safecpy(s->tr.authdom, _str_findattr(s->key->attr, "dom"), sizeof(s->tr.authdom));
|
||||
s->tr.type = s->astype;
|
||||
convTR2M(&s->tr, trbuf);
|
||||
memset(&tr, 0, sizeof tr);
|
||||
|
||||
/* get challenge from auth server */
|
||||
s->asfd = _authdial(nil, _str_findattr(s->key->attr, "dom"));
|
||||
if(s->asfd < 0)
|
||||
return failure(fss, Easproto);
|
||||
if(write(s->asfd, trbuf, TICKREQLEN) != TICKREQLEN)
|
||||
return failure(fss, Easproto);
|
||||
n = _asrdresp(s->asfd, s->chal, s->challen);
|
||||
if(n <= 0){
|
||||
if(n == 0)
|
||||
werrstr("_asrdresp short read");
|
||||
return failure(fss, nil);
|
||||
tr.type = astype;
|
||||
|
||||
if(strlen(s->hostid) >= sizeof tr.hostid){
|
||||
werrstr("hostid too long");
|
||||
return -1;
|
||||
}
|
||||
s->challen = n;
|
||||
fss->phase = SHaveChal;
|
||||
return RpcOk;
|
||||
strcpy(tr.hostid, s->hostid);
|
||||
|
||||
if(strlen(s->dom) >= sizeof tr.authdom){
|
||||
werrstr("domain too long");
|
||||
return -1;
|
||||
}
|
||||
strcpy(tr.authdom, s->dom);
|
||||
|
||||
if(strlen(user) >= sizeof tr.uid){
|
||||
werrstr("user name too long");
|
||||
return -1;
|
||||
}
|
||||
strcpy(tr.uid, user);
|
||||
convTR2M(&tr, trbuf);
|
||||
|
||||
if(xiowrite(s->asfd, trbuf, TICKREQLEN) != TICKREQLEN)
|
||||
return -1;
|
||||
|
||||
if((n=xioasrdresp(s->asfd, chal, challen)) <= 0)
|
||||
return -1;
|
||||
return n;
|
||||
}
|
||||
|
||||
Proto p9cr =
|
||||
static int
|
||||
p9crresp(ServerState *s, uchar *resp, int resplen)
|
||||
{
|
||||
.name= "p9cr",
|
||||
.init= p9crinit,
|
||||
.write= p9crwrite,
|
||||
.read= p9crread,
|
||||
.close= p9crclose,
|
||||
.keyprompt= "user? !password?"
|
||||
char tabuf[TICKETLEN+AUTHENTLEN];
|
||||
Authenticator a;
|
||||
Ticket t;
|
||||
Ticketreq tr;
|
||||
|
||||
if(xiowrite(s->asfd, resp, resplen) != resplen)
|
||||
return -1;
|
||||
|
||||
if(xioasrdresp(s->asfd, tabuf, TICKETLEN+AUTHENTLEN) != TICKETLEN+AUTHENTLEN)
|
||||
return 0;
|
||||
|
||||
convM2T(tabuf, &t, s->k->priv);
|
||||
if(t.num != AuthTs
|
||||
|| memcmp(t.chal, tr.chal, sizeof tr.chal) != 0){
|
||||
werrstr("key mismatch with auth server");
|
||||
return -1;
|
||||
}
|
||||
|
||||
convM2A(tabuf+TICKETLEN, &a, t.key);
|
||||
if(a.num != AuthAc
|
||||
|| memcmp(a.chal, tr.chal, sizeof a.chal) != 0
|
||||
|| a.id != 0){
|
||||
werrstr("key2 mismatch with auth server");
|
||||
return -1;
|
||||
}
|
||||
|
||||
s->t = t;
|
||||
return 1;
|
||||
}
|
||||
|
||||
static int
|
||||
p9response(char *pw, uchar *chal, uchar *resp)
|
||||
{
|
||||
char key[DESKEYLEN];
|
||||
uchar buf[8];
|
||||
ulong x;
|
||||
|
||||
passtokey(key, pw);
|
||||
memset(buf, 0, 8);
|
||||
snprint((char*)buf, sizeof buf, "%d", atoi((char*)chal));
|
||||
if(encrypt(key, buf, 8) < 0){
|
||||
werrstr("can't encrypt response");
|
||||
return -1;
|
||||
}
|
||||
x = (buf[0]<<24)+(buf[1]<<16)+(buf[2]<<8)+buf[3];
|
||||
return snprint((char*)resp, MAXRESP, "%.8lux", x);
|
||||
}
|
||||
|
||||
/*
|
||||
static int
|
||||
vncresponse(char *pw, uchar *chal, uchar *resp)
|
||||
{
|
||||
DESstate des;
|
||||
|
||||
memmove(resp, chal, MAXCHAL);
|
||||
setupDESstate(&des, 0, nil); // XXX put key in for 0
|
||||
desECBencrypt(resp, MAXCHAL, &des);
|
||||
return MAXCHAL;
|
||||
}
|
||||
*/
|
||||
|
||||
static Role
|
||||
p9crroles[] =
|
||||
{
|
||||
"client", p9crclient,
|
||||
"server", p9crserver,
|
||||
0
|
||||
};
|
||||
|
||||
Proto vnc =
|
||||
{
|
||||
.name= "vnc",
|
||||
.init= p9crinit,
|
||||
.write= p9crwrite,
|
||||
.read= p9crread,
|
||||
.close= p9crclose,
|
||||
.keyprompt= "!password?",
|
||||
.addkey= vncaddkey
|
||||
Proto p9cr = {
|
||||
"p9cr",
|
||||
p9crroles,
|
||||
"user? !password?",
|
||||
p9crcheck,
|
||||
nil
|
||||
};
|
||||
|
||||
/* still need to implement vnc key generator
|
||||
Proto vnc = {
|
||||
"vnc",
|
||||
p9crroles,
|
||||
"user? !password?",
|
||||
p9crcheck,
|
||||
nil
|
||||
};
|
||||
*/
|
||||
|
|
|
|||
|
|
@ -10,6 +10,7 @@ extern Proto mschap; /* chap.c */
|
|||
extern Proto p9any; /* p9any.c */
|
||||
extern Proto p9sk1; /* p9sk1.c */
|
||||
extern Proto p9sk2; /* p9sk2.c */
|
||||
extern Proto p9cr;
|
||||
extern Proto pass; /* pass.c */
|
||||
extern Proto rsa; /* rsa.c */
|
||||
|
||||
|
|
@ -19,6 +20,7 @@ Proto *prototab[] = {
|
|||
&dsa,
|
||||
&httpdigest,
|
||||
&p9any,
|
||||
&p9cr,
|
||||
&p9sk1,
|
||||
&p9sk2,
|
||||
&pass,
|
||||
|
|
|
|||
Loading…
Reference in a new issue