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netfilter: nf_conntrack_sip: extend request line validation

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on SIP requests, so a fragmented TCP SIP packet from an allow header starting with
 INVITE,NOTIFY,OPTIONS,REFER,REGISTER,UPDATE,SUBSCRIBE
 Content-Length: 0

will not bet interpreted as an INVITE request. Also Request-URI must start with an alphabetic character.

Confirm with RFC 3261
 Request-Line   =  Method SP Request-URI SP SIP-Version CRLF

Fixes: 30f33e6dee ("[NETFILTER]: nf_conntrack_sip: support method specific request/response handling")
Signed-off-by: Ulrich Weber <ulrich.weber@riverbed.com>
Acked-by: Marco Angaroni <marcoangaroni@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Ulrich Weber 2016-10-24 18:07:23 +02:00 committed by Pablo Neira Ayuso
parent dab45060a5
commit 444f901742
1 changed files with 4 additions and 1 deletions
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5
net/netfilter/nf_conntrack_sip.c
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@ -1436,9 +1436,12 @@ static int process_sip_request(struct sk_buff *skb, unsigned int protoff,
handler = &sip_handlers[i];
if (handler->request == NULL)
continue;
if (*datalen < handler->len ||
if (*datalen < handler->len + 2 ||
strncasecmp(*dptr, handler->method, handler->len))
continue;
if ((*dptr)[handler->len] != ' ' ||
!isalpha((*dptr)[handler->len+1]))
continue;
if (ct_sip_get_header(ct, *dptr, 0, *datalen, SIP_HDR_CSEQ,
&matchoff, &matchlen) <= 0) {