From 64a0c1c81e300f0f56f26604c81040784e3717f0 Mon Sep 17 00:00:00 2001 From: Ivan Skytte Jorgensen Date: Fri, 28 Oct 2005 15:39:02 -0700 Subject: [PATCH] [SCTP] Do not allow unprivileged programs initiating new associations on privileged ports. Signed-off-by: Ivan Skytte Jorgensen Signed-off-by: Sridhar Samudrala --- net/sctp/socket.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/net/sctp/socket.c b/net/sctp/socket.c index 97b556c1c450..b529af5e6f2a 100644 --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -1010,6 +1010,19 @@ static int __sctp_connect(struct sock* sk, err = -EAGAIN; goto out_free; } + } else { + /* + * If an unprivileged user inherits a 1-many + * style socket with open associations on a + * privileged port, it MAY be permitted to + * accept new associations, but it SHOULD NOT + * be permitted to open new associations. + */ + if (ep->base.bind_addr.port < PROT_SOCK && + !capable(CAP_NET_BIND_SERVICE)) { + err = -EACCES; + goto out_free; + } } scope = sctp_scope(&to); @@ -1515,6 +1528,19 @@ SCTP_STATIC int sctp_sendmsg(struct kiocb *iocb, struct sock *sk, err = -EAGAIN; goto out_unlock; } + } else { + /* + * If an unprivileged user inherits a one-to-many + * style socket with open associations on a privileged + * port, it MAY be permitted to accept new associations, + * but it SHOULD NOT be permitted to open new + * associations. + */ + if (ep->base.bind_addr.port < PROT_SOCK && + !capable(CAP_NET_BIND_SERVICE)) { + err = -EACCES; + goto out_unlock; + } } scope = sctp_scope(&to); -- 2.20.1