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[SCTP] Do not allow unprivileged programs initiating new associations on 

privileged ports.

Signed-off-by: Ivan Skytte Jorgensen <isj-sctp@i1.dk>
Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
This commit is contained in:
Ivan Skytte Jorgensen 2005-10-28 15:39:02 -07:00 committed by Sridhar Samudrala
parent 96a339985d
commit 64a0c1c81e
1 changed files with 26 additions and 0 deletions
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26
net/sctp/socket.c
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@ -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);