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| author | Marco Angaroni <marcoangaroni@gmail.com> | 2016-08-30 19:52:22 +0300 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2016-09-07 14:53:43 +0300 |
| commit | 1bcabc81ee94c0a65989128258f8c1d3e1c1b0ea (patch) | |
| tree | 75e6f975cf9d409200e29ba9e2272a3ddd351aa8 /net/netfilter | |
| parent | 22609b43b194917dce2188ae9a78bc40a14e67b5 (diff) | |
| download | linux-1bcabc81ee94c0a65989128258f8c1d3e1c1b0ea.tar.xz | |
netfilter: nf_ct_sip: allow tab character in SIP headers
Current parsing methods for SIP headers do not allow the presence of
tab characters between header name and header value. As a result Call-ID
SIP headers like the following are discarded by IPVS SIP persistence
engine:
"Call-ID\t: mycallid@abcde"
"Call-ID:\tmycallid@abcde"
In above examples Call-IDs are represented as strings in C language.
Obviously in real message we have byte "09" before/after colon (":").
Proposed fix is in nf_conntrack_sip module.
Function sip_skip_whitespace() should skip tabs in addition to spaces,
since in SIP grammar whitespace (WSP) corresponds to space or tab.
Below is an extract of relevant SIP ABNF syntax.
Call-ID = ( "Call-ID" / "i" ) HCOLON callid
callid = word [ "@" word ]
HCOLON = *( SP / HTAB ) ":" SWS
SWS = [LWS] ; sep whitespace
LWS = [*WSP CRLF] 1*WSP ; linear whitespace
WSP = SP / HTAB
word = 1*(alphanum / "-" / "." / "!" / "%" / "*" /
"_" / "+" / "`" / "'" / "~" /
"(" / ")" / "<" / ">" /
":" / "\" / DQUOTE /
"/" / "[" / "]" / "?" /
"{" / "}" )
Signed-off-by: Marco Angaroni <marcoangaroni@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter')
| -rw-r--r-- | net/netfilter/nf_conntrack_sip.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/netfilter/nf_conntrack_sip.c b/net/netfilter/nf_conntrack_sip.c index d8035351aff5..621b81c7bddc 100644 --- a/net/netfilter/nf_conntrack_sip.c +++ b/net/netfilter/nf_conntrack_sip.c @@ -330,7 +330,7 @@ static const char *sip_follow_continuation(const char *dptr, const char *limit) static const char *sip_skip_whitespace(const char *dptr, const char *limit) { for (; dptr < limit; dptr++) { - if (*dptr == ' ') + if (*dptr == ' ' || *dptr == '\t') continue; if (*dptr != '\r' && *dptr != '\n') break; |