git: 09c7f2386973 - main - pfctl: delay label macro expansion until after rule optimisation
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Date: Fri, 15 Oct 2021 22:35:43 UTC
The branch main has been updated by kp:
URL: https://cgit.FreeBSD.org/src/commit/?id=09c7f2386973f8c36978895a7600320916bc3d07
commit 09c7f2386973f8c36978895a7600320916bc3d07
Author: Kristof Provost <kp@FreeBSD.org>
AuthorDate: 2021-10-13 14:06:47 +0000
Commit: Kristof Provost <kp@FreeBSD.org>
CommitDate: 2021-10-15 20:19:45 +0000
pfctl: delay label macro expansion until after rule optimisation
We used to expand the $nr macro in labels into the rule number prior to
the optimisation step. This would occasionally produce incorrect rule
numbers in the labels.
Delay all macro expansion until after the optimisation step to ensure
that we expand the correct values.
MFC after: 1 week
Reported by: Özkan KIRIK <ozkan.kirik@gmail.com>
Differential Revision: https://reviews.freebsd.org/D32488
---
sbin/pfctl/parse.y | 85 +++++++++++++++++++++++-------------------------------
sbin/pfctl/pfctl.c | 6 ++++
sbin/pfctl/pfctl.h | 2 ++
3 files changed, 44 insertions(+), 49 deletions(-)
diff --git a/sbin/pfctl/parse.y b/sbin/pfctl/parse.y
index 4be7bd16649a..e22e60182c73 100644
--- a/sbin/pfctl/parse.y
+++ b/sbin/pfctl/parse.y
@@ -333,14 +333,12 @@ 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 *);
+ struct pf_rule_addr *);
void expand_label_port(const char *, char *, size_t,
- struct node_port *);
+ struct pf_rule_addr *);
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);
+void expand_label_nr(const char *, char *, size_t,
+ struct pfctl_rule *);
void expand_rule(struct pfctl_rule *, struct node_if *,
struct node_host *, struct node_proto *, struct node_os *,
struct node_host *, struct node_port *, struct node_host *,
@@ -5022,17 +5020,17 @@ expand_label_if(const char *name, char *label, size_t len, const char *ifname)
void
expand_label_addr(const char *name, char *label, size_t len, sa_family_t af,
- struct node_host *h)
+ struct pf_rule_addr *addr)
{
char tmp[64], tmp_not[66];
if (strstr(label, name) != NULL) {
- switch (h->addr.type) {
+ switch (addr->addr.type) {
case PF_ADDR_DYNIFTL:
- snprintf(tmp, sizeof(tmp), "(%s)", h->addr.v.ifname);
+ snprintf(tmp, sizeof(tmp), "(%s)", addr->addr.v.ifname);
break;
case PF_ADDR_TABLE:
- snprintf(tmp, sizeof(tmp), "<%s>", h->addr.v.tblname);
+ snprintf(tmp, sizeof(tmp), "<%s>", addr->addr.v.tblname);
break;
case PF_ADDR_NOROUTE:
snprintf(tmp, sizeof(tmp), "no-route");
@@ -5041,18 +5039,18 @@ expand_label_addr(const char *name, char *label, size_t len, sa_family_t af,
snprintf(tmp, sizeof(tmp), "urpf-failed");
break;
case PF_ADDR_ADDRMASK:
- if (!af || (PF_AZERO(&h->addr.v.a.addr, af) &&
- PF_AZERO(&h->addr.v.a.mask, af)))
+ if (!af || (PF_AZERO(&addr->addr.v.a.addr, af) &&
+ PF_AZERO(&addr->addr.v.a.mask, af)))
snprintf(tmp, sizeof(tmp), "any");
else {
char a[48];
int bits;
- if (inet_ntop(af, &h->addr.v.a.addr, a,
+ if (inet_ntop(af, &addr->addr.v.a.addr, a,
sizeof(a)) == NULL)
snprintf(tmp, sizeof(tmp), "?");
else {
- bits = unmask(&h->addr.v.a.mask, af);
+ bits = unmask(&addr->addr.v.a.mask, af);
if ((af == AF_INET && bits < 32) ||
(af == AF_INET6 && bits < 128))
snprintf(tmp, sizeof(tmp),
@@ -5068,7 +5066,7 @@ expand_label_addr(const char *name, char *label, size_t len, sa_family_t af,
break;
}
- if (h->not) {
+ if (addr->neg) {
snprintf(tmp_not, sizeof(tmp_not), "! %s", tmp);
expand_label_str(label, len, name, tmp_not);
} else
@@ -5078,30 +5076,30 @@ expand_label_addr(const char *name, char *label, size_t len, sa_family_t af,
void
expand_label_port(const char *name, char *label, size_t len,
- struct node_port *port)
+ struct pf_rule_addr *addr)
{
char a1[6], a2[6], op[13] = "";
if (strstr(label, name) != NULL) {
- snprintf(a1, sizeof(a1), "%u", ntohs(port->port[0]));
- snprintf(a2, sizeof(a2), "%u", ntohs(port->port[1]));
- if (!port->op)
+ snprintf(a1, sizeof(a1), "%u", ntohs(addr->port[0]));
+ snprintf(a2, sizeof(a2), "%u", ntohs(addr->port[1]));
+ if (!addr->port_op)
;
- else if (port->op == PF_OP_IRG)
+ else if (addr->port_op == PF_OP_IRG)
snprintf(op, sizeof(op), "%s><%s", a1, a2);
- else if (port->op == PF_OP_XRG)
+ else if (addr->port_op == PF_OP_XRG)
snprintf(op, sizeof(op), "%s<>%s", a1, a2);
- else if (port->op == PF_OP_EQ)
+ else if (addr->port_op == PF_OP_EQ)
snprintf(op, sizeof(op), "%s", a1);
- else if (port->op == PF_OP_NE)
+ else if (addr->port_op == PF_OP_NE)
snprintf(op, sizeof(op), "!=%s", a1);
- else if (port->op == PF_OP_LT)
+ else if (addr->port_op == PF_OP_LT)
snprintf(op, sizeof(op), "<%s", a1);
- else if (port->op == PF_OP_LE)
+ else if (addr->port_op == PF_OP_LE)
snprintf(op, sizeof(op), "<=%s", a1);
- else if (port->op == PF_OP_GT)
+ else if (addr->port_op == PF_OP_GT)
snprintf(op, sizeof(op), ">%s", a1);
- else if (port->op == PF_OP_GE)
+ else if (addr->port_op == PF_OP_GE)
snprintf(op, sizeof(op), ">=%s", a1);
expand_label_str(label, len, name, op);
}
@@ -5125,29 +5123,27 @@ 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)
+expand_label_nr(const char *name, char *label, size_t len,
+ struct pfctl_rule *r)
{
char n[11];
if (strstr(label, name) != NULL) {
- snprintf(n, sizeof(n), "%u", pf->anchor->match);
+ snprintf(n, sizeof(n), "%u", r->nr);
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,
- struct node_host *dst_host, struct node_port *dst_port,
- u_int8_t proto)
+expand_label(char *label, size_t len, struct pfctl_rule *r)
{
- expand_label_if("$if", label, len, ifname);
- expand_label_addr("$srcaddr", label, len, af, src_host);
- expand_label_addr("$dstaddr", label, len, af, dst_host);
- 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);
+ expand_label_if("$if", label, len, r->ifname);
+ expand_label_addr("$srcaddr", label, len, r->af, &r->src);
+ expand_label_addr("$dstaddr", label, len, r->af, &r->dst);
+ expand_label_port("$srcport", label, len, &r->src);
+ expand_label_port("$dstport", label, len, &r->dst);
+ expand_label_proto("$proto", label, len, r->proto);
+ expand_label_nr("$nr", label, len, r);
}
int
@@ -5481,15 +5477,6 @@ expand_rule(struct pfctl_rule *r,
if (strlcpy(r->match_tagname, match_tagname,
sizeof(r->match_tagname)) >= sizeof(r->match_tagname))
errx(1, "expand_rule: strlcpy");
- for (int i = 0; i < PF_RULE_MAX_LABEL_COUNT; i++)
- expand_label(r->label[i], PF_RULE_LABEL_SIZE,
- r->ifname, r->af, src_host, src_port, dst_host,
- dst_port, proto->proto);
- expand_label(r->tagname, PF_TAG_NAME_SIZE, r->ifname, r->af,
- src_host, src_port, dst_host, dst_port, proto->proto);
- expand_label(r->match_tagname, PF_TAG_NAME_SIZE, r->ifname,
- r->af, src_host, src_port, dst_host, dst_port,
- proto->proto);
error += check_netmask(src_host, r->af);
error += check_netmask(dst_host, r->af);
diff --git a/sbin/pfctl/pfctl.c b/sbin/pfctl/pfctl.c
index d7bde0012e9b..a0eec1b09289 100644
--- a/sbin/pfctl/pfctl.c
+++ b/sbin/pfctl/pfctl.c
@@ -1528,6 +1528,12 @@ 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);
+
+ for (int i = 0; i < PF_RULE_MAX_LABEL_COUNT; i++)
+ expand_label(r->label[i], PF_RULE_LABEL_SIZE, r);
+ expand_label(r->tagname, PF_TAG_NAME_SIZE, r);
+ expand_label(r->match_tagname, PF_TAG_NAME_SIZE, r);
+
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..606eb729cd44 100644
--- a/sbin/pfctl/pfctl.h
+++ b/sbin/pfctl/pfctl.h
@@ -138,6 +138,8 @@ void pf_remove_if_empty_ruleset(struct pfctl_ruleset *);
struct pfctl_ruleset *pf_find_ruleset(const char *);
struct pfctl_ruleset *pf_find_or_create_ruleset(const char *);
+void expand_label(char *, size_t, struct pfctl_rule *);
+
const char *pfctl_proto2name(int);
#endif /* _PFCTL_H_ */