ndb/dns: fix leak in myaddr(), normalize ip strings
remove myaddr() function and replace with myip() function that receives binary ip address. and don't use string comparsion for ip addresses... parse and then ipcmp(). for sanity reasons, normalize ip address strings and reject unparsable ones. done by calling ipalookup() with a binary ip address.
This commit is contained in:
cinap_lenrek
parent
b3b938d5ec
commit
549a6745e3
4 changed files with 80 additions and 78 deletions
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@ -316,8 +316,7 @@ dblookup1(char *name, int type, int auth, int ttl)
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nstrcpy(dname, nt->val, sizeof dname);
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found = 1;
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}
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if(strcmp(attr, nt->attr) == 0){
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rp = (*f)(t, nt);
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if(strcmp(attr, nt->attr) == 0 && (rp = (*f)(t, nt)) != nil){
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rp->auth = auth;
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rp->db = 1;
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if(ttl)
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@ -336,12 +335,11 @@ dblookup1(char *name, int type, int auth, int ttl)
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/* search whole entry */
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for(nt = t; nt; nt = nt->entry)
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if(nt->ptr == 0 && strcmp(attr, nt->attr) == 0){
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rp = (*f)(t, nt);
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if(nt->ptr == 0 && strcmp(attr, nt->attr) == 0 && (rp = (*f)(t, nt)) != nil){
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rp->auth = auth;
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rp->db = 1;
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if(ttl)
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rp->ttl = ttl;
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rp->auth = auth;
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if(dp == nil)
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dp = idnlookup(dname, Cin, 1);
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rp->owner = dp;
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@ -358,26 +356,22 @@ dblookup1(char *name, int type, int auth, int ttl)
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* make various types of resource records from a database entry
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*/
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static RR*
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addrrr(Ndbtuple *entry, Ndbtuple *pair)
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addrrr(Ndbtuple*, Ndbtuple *pair)
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{
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RR *rp;
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uchar addr[IPaddrlen];
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uchar ip[IPaddrlen];
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USED(entry);
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parseip(addr, pair->val);
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if(isv4(addr))
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rp = rralloc(Ta);
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else
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rp = rralloc(Taaaa);
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rp->ip = dnlookup(pair->val, Cin, 1);
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if(parseip(ip, pair->val) == -1)
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return nil;
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rp = rralloc(isv4(ip) ? Ta : Taaaa);
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rp->ip = ipalookup(ip, Cin, 1);
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return rp;
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}
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static RR*
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nullrr(Ndbtuple *entry, Ndbtuple *pair)
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nullrr(Ndbtuple*, Ndbtuple *pair)
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{
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RR *rp;
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USED(entry);
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rp = rralloc(Tnull);
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rp->null->data = (uchar*)estrdup(pair->val);
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rp->null->dlen = strlen((char*)rp->null->data);
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@ -389,13 +383,12 @@ nullrr(Ndbtuple *entry, Ndbtuple *pair)
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* <= 255 byte ones.
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*/
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static RR*
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txtrr(Ndbtuple *entry, Ndbtuple *pair)
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txtrr(Ndbtuple*, Ndbtuple *pair)
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{
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RR *rp;
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Txt *t, **l;
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int i, len, sofar;
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USED(entry);
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rp = rralloc(Ttxt);
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l = &rp->txt;
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rp->txt = nil;
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@ -420,11 +413,10 @@ txtrr(Ndbtuple *entry, Ndbtuple *pair)
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return rp;
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}
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static RR*
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cnamerr(Ndbtuple *entry, Ndbtuple *pair)
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cnamerr(Ndbtuple*, Ndbtuple *pair)
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{
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RR *rp;
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USED(entry);
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rp = rralloc(Tcname);
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rp->host = idnlookup(pair->val, Cin, 1);
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return rp;
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@ -453,11 +445,10 @@ nsrr(Ndbtuple *entry, Ndbtuple *pair)
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return rp;
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}
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static RR*
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ptrrr(Ndbtuple *entry, Ndbtuple *pair)
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ptrrr(Ndbtuple*, Ndbtuple *pair)
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{
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RR *rp;
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USED(entry);
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rp = rralloc(Tns);
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rp->ptr = dnlookup(pair->val, Cin, 1);
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return rp;
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@ -815,33 +806,29 @@ baddelegation(RR *rp, RR *nsrp, uchar *addr)
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}
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int
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myaddr(char *addr)
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myip(uchar *ip)
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{
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char *line, *sp;
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char buf[64];
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char buf[Maxpath];
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uchar ipa[IPaddrlen];
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Biobuf *bp;
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if(ipcmp(ipaddr, IPnoaddr) == 0)
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if(myipaddr(ipaddr, mntpt) < 0)
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return -1;
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snprint(buf, sizeof buf, "%I", ipaddr);
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if (strcmp(addr, buf) == 0) {
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dnslog("rejecting my ip %s as local dns server", addr);
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if(ipcmp(ipaddr, ip) == 0)
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return 1;
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}
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snprint(buf, sizeof buf, "%s/ipselftab", mntpt);
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bp = Bopen(buf, OREAD);
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if (bp != nil) {
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while ((line = Brdline(bp, '\n')) != nil) {
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if(bp != nil) {
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while((line = Brdline(bp, '\n')) != nil) {
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line[Blinelen(bp) - 1] = '\0';
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sp = strchr(line, ' ');
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if (sp) {
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if((sp = strchr(line, ' ')) != nil) {
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*sp = '\0';
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if (strcmp(addr, line) == 0) {
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dnslog("rejecting my ip %s as local dns server",
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addr);
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if(parseip(ipa, line) != -1 && ipcmp(ipa, ip) == 0) {
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Bterm(bp);
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return 1;
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}
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}
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@ -851,39 +838,52 @@ myaddr(char *addr)
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return 0;
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}
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static char *locdns[20];
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static QLock locdnslck;
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static void
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addlocaldnsserver(DN *dp, int class, char *ipaddr, int i)
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{
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int n;
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DN *nsdp;
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RR *rp;
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char buf[32];
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uchar ip[IPaddrlen];
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DN *nsdp, *ipdp;
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RR *rp, *tp;
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int type, n;
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char buf[32];
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if(parseip(ip, ipaddr) == -1 || ipcmp(ip, IPnoaddr) == 0){
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dnslog("rejecting bad ip %s as local dns server", ipaddr);
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return;
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}
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/* reject our own ip addresses so we don't query ourselves via udp */
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if (myaddr(ipaddr))
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if(myip(ip)){
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dnslog("rejecting my ip %I as local dns server", ip);
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return;
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}
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qlock(&locdnslck);
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for (n = 0; n < i && n < nelem(locdns) && locdns[n]; n++)
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if (strcmp(locdns[n], ipaddr) == 0) {
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dnslog("rejecting duplicate local dns server ip %s",
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ipaddr);
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qunlock(&locdnslck);
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return;
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/* A or AAAA record */
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type = isv4(ip) ? Ta : Taaaa;
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ipdp = ipalookup(ip, class, 1);
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/* check duplicate ip */
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for(n = 0; n < i; n++){
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snprint(buf, sizeof buf, "local#dns#server%d", n);
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nsdp = dnlookup(buf, class, 0);
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if(nsdp == nil)
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continue;
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rp = rrlookup(nsdp, type, NOneg);
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for(tp = rp; tp != nil; tp = tp->next){
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if(tp->ip == ipdp){
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dnslog("rejecting duplicate local dns server ip %I", ip);
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rrfreelist(rp);
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return;
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}
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}
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if (n < nelem(locdns))
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if (locdns[n] == nil || ++n < nelem(locdns))
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locdns[n] = strdup(ipaddr); /* remember 1st few local ns */
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qunlock(&locdnslck);
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rrfreelist(rp);
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}
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snprint(buf, sizeof buf, "local#dns#server%d", i);
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nsdp = dnlookup(buf, class, 1);
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/* ns record for name server, make up an impossible name */
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rp = rralloc(Tns);
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snprint(buf, sizeof buf, "local#dns#server%d", i);
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nsdp = dnlookup(buf, class, 1);
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rp->host = nsdp;
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rp->owner = dp; /* e.g., local#dns#servers */
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rp->local = 1;
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@ -892,12 +892,8 @@ addlocaldnsserver(DN *dp, int class, char *ipaddr, int i)
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rrattach(rp, Authoritative); /* will not attach rrs in my area */
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dnagenever(dp);
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/* A or AAAA record */
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if (parseip(ip, ipaddr) >= 0 && isv4(ip))
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rp = rralloc(Ta);
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else
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rp = rralloc(Taaaa);
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rp->ip = dnlookup(ipaddr, class, 1);
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rp = rralloc(type);
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rp->ip = ipdp;
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rp->owner = nsdp;
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rp->local = 1;
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rp->db = 1;
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@ -905,7 +901,7 @@ addlocaldnsserver(DN *dp, int class, char *ipaddr, int i)
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rrattach(rp, Authoritative); /* will not attach rrs in my area */
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dnagenever(nsdp);
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dnslog("added local dns server %s at %s", buf, ipaddr);
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dnslog("added local dns server %s at %I", buf, ip);
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}
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/*
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@ -917,7 +913,7 @@ dnsservers(int class)
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{
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int i, n;
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char *p;
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char *args[5];
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char *args[16];
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Ndbtuple *t, *nt;
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RR *nsrp;
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DN *dp;
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@ -1208,8 +1204,7 @@ insidens(uchar *ip)
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for (t = innmsrvs; t != nil; t = t->entry)
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if (strcmp(t->attr, "ip") == 0) {
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parseip(ipa, t->val);
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if (memcmp(ipa, ip, sizeof ipa) == 0)
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if (parseip(ipa, t->val) != -1 && ipcmp(ipa, ip) == 0)
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return 1;
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}
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return 0;
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@ -1224,7 +1219,8 @@ outsidensip(int n, uchar *ip)
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i = 0;
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for (t = outnmsrvs; t != nil; t = t->entry)
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if (strcmp(t->attr, "ip") == 0 && i++ == n) {
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parseip(ip, t->val);
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if (parseip(ip, t->val) == -1)
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return -1;
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return 0;
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}
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return -1;
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@ -233,6 +233,15 @@ idnlookup(char *name, int class, int enter)
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return dnlookup(name, class, enter);
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}
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DN*
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ipalookup(uchar *ip, int class, int enter)
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{
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char addr[64];
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snprint(addr, sizeof(addr), "%I", ip);
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return dnlookup(addr, class, enter);
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}
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static int
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rrsame(RR *rr1, RR *rr2)
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{
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@ -922,13 +922,12 @@ static int
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mydnsquery(Query *qp, int medium, uchar *udppkt, int len)
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{
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int rv, nfd;
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char conndir[40], addr[128], domain[64];
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char conndir[40], addr[128];
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uchar belen[2];
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NetConnInfo *nci;
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rv = -1;
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snprint(domain, sizeof(domain), "%I", udppkt);
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if (myaddr(domain))
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if (myip(udppkt))
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return rv;
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switch (medium) {
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case Udp:
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@ -958,9 +957,8 @@ mydnsquery(Query *qp, int medium, uchar *udppkt, int len)
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case Tcp:
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/* send via TCP & keep fd around for reply */
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memmove(qp->tcpip, udppkt, sizeof qp->tcpip);
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snprint(addr, sizeof addr, "%s/tcp!%s!dns",
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(mntpt && *mntpt) ? mntpt : "/net",
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domain);
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snprint(addr, sizeof addr, "%s/tcp!%I!dns",
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(mntpt && *mntpt) ? mntpt : "/net", udppkt);
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alarm(10*1000);
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qp->tcpfd = dial(addr, nil, conndir, &qp->tcpctlfd);
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alarm(0);
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@ -1049,7 +1047,7 @@ xmitquery(Query *qp, int medium, int depth, uchar *obuf, int inns, int len)
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if((1<<p->nx) > qp->ndest)
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continue;
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if(memcmp(p->a, IPnoaddr, sizeof IPnoaddr) == 0)
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if(ipcmp(p->a, IPnoaddr) == 0)
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continue; /* mistake */
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procsetname("udp %sside query to %I/%s %s %s",
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@ -1387,7 +1385,7 @@ queryns(Query *qp, int depth, uchar *ibuf, uchar *obuf, ulong waitms, int inns)
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if(debug)
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dnslog("queryns got reply from %I", srcip);
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for(p = qp->dest; p < qp->curdest; p++)
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if(memcmp(p->a, srcip, sizeof p->a) == 0)
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if(ipcmp(p->a, srcip) == 0)
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break;
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if(p >= qp->curdest){
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dnslog("response from %I but no destination", srcip);
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@ -449,13 +449,12 @@ void dnagedb(void);
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void dnagenever(DN *);
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void dnauthdb(void);
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void dndump(char*);
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void dnget(void);
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void dninit(void);
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DN* dnlookup(char*, int, int);
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DN* idnlookup(char*, int, int);
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DN* ipalookup(uchar*, int, int);
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void dnptr(uchar*, uchar*, char*, int, int, int);
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void dnpurge(void);
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void dnput(void);
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void dnslog(char*, ...);
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void dnstats(char *file);
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void* emalloc(int);
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@ -501,7 +500,7 @@ RR* dnsservers(int);
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RR* domainlist(int);
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int insideaddr(char *dom);
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int insidens(uchar *ip);
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int myaddr(char *addr);
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int myip(uchar *ip);
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int opendatabase(void);
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int outsidensip(int, uchar *ip);
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