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- Add extra dnamelen checks to ipdnametoaddr and netblockdnametoaddr

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This commit is contained in:
Ralph Dolmans 2020-01-29 15:16:44 +01:00
parent 7da16febc4
commit 88a706acf8
1 changed files with 16 additions and 5 deletions
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21
util/net_help.c
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@ -296,6 +296,11 @@ static int ipdnametoaddr(uint8_t* dname, size_t dnamelen,
size_t len = 0;
int i;
*af = AF_INET;
/* need 1 byte for label length */
if(dnamelen < 1)
return 0;
if(dnamelabs > 6 ||
dname_has_label(dname, dnamelen, (uint8_t*)"\002zz")) {
*af = AF_INET6;
@ -363,17 +368,23 @@ int netblockdnametoaddr(uint8_t* dname, size_t dnamelen,
struct sockaddr_storage* addr, socklen_t* addrlen, int* net, int* af)
{
char buff[3 /* 3 digit netblock */ + 1];
if(*dname > 3)
size_t nlablen;
if(dnamelen < 1 || *dname > 3)
/* netblock invalid */
return 0;
memcpy(buff, dname+1, *dname);
buff[*dname] = '\0';
nlablen = *dname;
if(dnamelen < 1 + nlablen)
return 0;
memcpy(buff, dname+1, nlablen);
buff[nlablen] = '\0';
*net = atoi(buff);
if(*net == 0 && strcmp(buff, "0") != 0)
return 0;
dname += *dname;
dname += nlablen;
dname++;
if(!ipdnametoaddr(dname, dnamelen, addr, addrlen, af))
if(!ipdnametoaddr(dname, dnamelen-1-nlablen, addr, addrlen, af))
return 0;
if((*af == AF_INET6 && *net > 128) || (*af == AF_INET && *net > 32))
return 0;