Re: pf label $nr macro expand reproducable bug
- Reply: Özkan KIRIK : "Re: pf label $nr macro expand reproducable bug"
- In reply to: Kristof Provost : "Re: pf label $nr macro expand reproducable bug"
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Date: Sat, 02 Oct 2021 17:31:37 UTC
Thank you! I'll try it. Have a nice day, Best regards, Ozkan On Sat, Oct 2, 2021 at 7:03 PM Kristof Provost <kp@freebsd.org> wrote: > > On 22 Sep 2021, at 11:47, Özkan KIRIK wrote: > > Hi Kristof, > > I tried many things and I found the real problem to reproduce the bug. > Tested with the latest stable/12. > And also tested with Live CD without installing > (https://download.freebsd.org/ftp/snapshots/ISO-IMAGES/12.2/FreeBSD-12.2-STABLE-amd64-20210916-r370608-disc1.iso). > The result is same. > > My determination is the problem in the rule optimizer of pf. You can > see the difference with / without ruleset optimization. > Without ruleset optimization, $nr macro expanding is true. otherwise false. > > if the interface used in the rule, have multiple IP addresses that > rule optimizer removes lines then the rule number expanding fails. ie: > > > Yeah, that makes sense. It looks like the problem is that we expand the $nr tag before the ruleset optimisation, so we end up using the wrong rule number. > > As a first attempt this also seems to work: > > diff --git a/sbin/pfctl/parse.y b/sbin/pfctl/parse.y > index 89d5f330da47..eb38fd9e344e 100644 > --- a/sbin/pfctl/parse.y > +++ b/sbin/pfctl/parse.y > @@ -330,14 +330,12 @@ int filter_consistent(struct pfctl_rule *, int); > int nat_consistent(struct pfctl_rule *); > int rdr_consistent(struct pfctl_rule *); > int process_tabledef(char *, struct table_opts *); > -void expand_label_str(char *, size_t, const char *, const char *); > void expand_label_if(const char *, char *, size_t, const char *); > void expand_label_addr(const char *, char *, size_t, u_int8_t, > struct node_host *); > void expand_label_port(const char *, char *, size_t, > struct node_port *); > void expand_label_proto(const char *, char *, size_t, u_int8_t); > -void expand_label_nr(const char *, char *, size_t); > void expand_label(char *, size_t, const char *, u_int8_t, > struct node_host *, struct node_port *, struct node_host *, > struct node_port *, u_int8_t); > @@ -5125,17 +5123,6 @@ expand_label_proto(const char *name, char *label, size_t len, u_int8_t proto) > } > } > > -void > -expand_label_nr(const char *name, char *label, size_t len) > -{ > - char n[11]; > - > - if (strstr(label, name) != NULL) { > - snprintf(n, sizeof(n), "%u", pf->anchor->match); > - expand_label_str(label, len, name, n); > - } > -} > - > void > expand_label(char *label, size_t len, const char *ifname, sa_family_t af, > struct node_host *src_host, struct node_port *src_port, > @@ -5148,7 +5135,6 @@ expand_label(char *label, size_t len, const char *ifname, sa_family_t af, > expand_label_port("$srcport", label, len, src_port); > expand_label_port("$dstport", label, len, dst_port); > expand_label_proto("$proto", label, len, proto); > - expand_label_nr("$nr", label, len); > } > > int > diff --git a/sbin/pfctl/pfctl.c b/sbin/pfctl/pfctl.c > index d7bde0012e9b..749d73705f45 100644 > --- a/sbin/pfctl/pfctl.c > +++ b/sbin/pfctl/pfctl.c > @@ -1528,6 +1528,15 @@ pfctl_load_ruleset(struct pfctl *pf, char *path, struct pfctl_ruleset *rs, > > while ((r = TAILQ_FIRST(rs->rules[rs_num].active.ptr)) != NULL) { > TAILQ_REMOVE(rs->rules[rs_num].active.ptr, r, entries); > + char n[11]; > + snprintf(n, sizeof(n), "%u", r->nr); > + for (int i = 0; i < PF_RULE_MAX_LABEL_COUNT; i++) { > + expand_label_str(r->label[i], PF_RULE_LABEL_SIZE, > + "$nr", n); > + } > + expand_label_str(r->tagname, PF_TAG_NAME_SIZE, "$nr", n); > + expand_label_str(r->match_tagname, PF_TAG_NAME_SIZE, "$nr", n); > + > if ((error = pfctl_load_rule(pf, path, r, depth))) > goto error; > if (r->anchor) { > diff --git a/sbin/pfctl/pfctl.h b/sbin/pfctl/pfctl.h > index 80ef184fa90f..d725341d1cd7 100644 > --- a/sbin/pfctl/pfctl.h > +++ b/sbin/pfctl/pfctl.h > @@ -139,5 +139,6 @@ struct pfctl_ruleset *pf_find_ruleset(const char *); > struct pfctl_ruleset *pf_find_or_create_ruleset(const char *); > > const char *pfctl_proto2name(int); > +void expand_label_str(char *, size_t, const char *, const char *); > > #endif /* _PFCTL_H_ */ > > I think I want to restructure that a bit, but this should already work. > > Best regards, > Kristof