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iptables:fix iptables docker daemon error

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chengyechun 2022-12-26 21:06:13 +08:00 committed by renmingshuai
parent 8e4b92e1d6
commit f3988dd0a1
8 changed files with 792 additions and 1 deletions
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90
backport-Improve-error-messages-for-unsupported-extensions.patch Normal file
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@ -0,0 +1,90 @@
From 17534cb18ed0a5052dc45c117401251359dba6aa Mon Sep 17 00:00:00 2001
From: Phil Sutter <phil@nwl.cc>
Date: Fri, 11 Feb 2022 17:47:22 +0100
Subject: Improve error messages for unsupported extensions
If a given extension was not supported by the kernel, iptables would
print a rather confusing error message if extension parameters were
given:
| # rm /lib/modules/$(uname -r)/kernel/net/netfilter/xt_LOG.ko
| # iptables -A FORWARD -j LOG --log-prefix foo
| iptables v1.8.7 (legacy): unknown option "--log-prefix"
Avoid this by pretending extension revision 0 is always supported. It is
the same hack as used to successfully print extension help texts as
unprivileged user, extended to all error codes to serve privileged ones
as well.
In addition, print a warning if kernel rejected revision 0 and it's not
a permissions problem. This helps users find out which extension in a
rule the kernel didn't like.
Finally, the above commands result in these messages:
| Warning: Extension LOG revision 0 not supported, missing kernel
module?
| iptables: No chain/target/match by that name.
Or, for iptables-nft:
| Warning: Extension LOG revision 0 not supported, missing kernel
module?
| iptables v1.8.7 (nf_tables): RULE_APPEND failed (No such file or
directory): rule in chain FORWARD
Conflict: NA
Reference:
https://git.netfilter.org/iptables/commit/?id=17534cb18ed0a5052dc45c117401251359dba6aa
Signed-off-by: Phil Sutter <phil@nwl.cc>
---
iptables/nft.c | 13 +++++++++----
libxtables/xtables.c | 7 ++++++-
2 files changed, 15 insertions(+), 5 deletions(-)
diff --git a/iptables/nft.c b/iptables/nft.c
index c9a4940..18bf21c 100644
--- a/iptables/nft.c
+++ b/iptables/nft.c
@@ -3245,11 +3245,16 @@ int nft_compatible_revision(const char *name, uint8_t rev, int opt)
err:
mnl_socket_close(nl);
- /* pretend revision 0 is valid if not permitted to check -
- * this is required for printing extension help texts as user */
- if (ret < 0 && errno == EPERM && rev == 0)
+ /* pretend revision 0 is valid -
+ * this is required for printing extension help texts as user, also
+ * helps error messaging on unavailable kernel extension */
+ if (ret < 0 && rev == 0) {
+ if (errno != EPERM)
+ fprintf(stderr,
+ "Warning: Extension %s revision 0 not supported, missing kernel module?\n",
+ name);
return 1;
-
+ }
return ret < 0 ? 0 : 1;
}
diff --git a/libxtables/xtables.c b/libxtables/xtables.c
index bc42ba8..1f585e5 100644
--- a/libxtables/xtables.c
+++ b/libxtables/xtables.c
@@ -923,7 +923,12 @@ int xtables_compatible_revision(const char *name, uint8_t revision, int opt)
/* Definitely don't support this? */
if (errno == ENOENT || errno == EPROTONOSUPPORT) {
close(sockfd);
- return 0;
+ /* Pretend revision 0 support for better error messaging */
+ if (revision == 0)
+ fprintf(stderr,
+ "Warning: Extension %s revision 0 not supported, missing kernel module?\n",
+ name);
+ return (revision == 0);
} else if (errno == ENOPROTOOPT) {
close(sockfd);
/* Assume only revision 0 support (old kernel) */
--
2.23.0

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backport-libxtables-Make-sure-extensions-register-in-revision-order.patch Normal file
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From b3ac87038f4e45141831d9ab485a2f627daba3f1 Mon Sep 17 00:00:00 2001
From: Phil Sutter <phil@nwl.cc>
Date: Mon, 21 Sep 2020 13:42:06 +0200
Subject: libxtables: Make sure extensions register in revision order
Insert extensions into pending lists in ordered fashion: Group by
extension name (and, for matches, family) and order groups by descending
revision number.
This allows to simplify the later full registration considerably. Since
that involves kernel compatibility checks, the extra cycles here pay off
eventually.
Signed-off-by: Phil Sutter <phil@nwl.cc>
---
libxtables/xtables.c | 71 ++++++++++++++++++++++++++++++++++++++++++++++------
1 file changed, 64 insertions(+), 7 deletions(-)
diff --git a/libxtables/xtables.c b/libxtables/xtables.c
index 8907ba20..de52e3e2 100644
--- a/libxtables/xtables.c
+++ b/libxtables/xtables.c
@@ -948,8 +948,14 @@ static void xtables_check_options(const char *name, const struct option *opt)
}
}
+static int xtables_match_prefer(const struct xtables_match *a,
+ const struct xtables_match *b);
+
void xtables_register_match(struct xtables_match *me)
{
+ struct xtables_match **pos;
+ bool seen_myself = false;
+
if (me->next) {
fprintf(stderr, "%s: match \"%s\" already registered\n",
xt_params->program_name, me->name);
@@ -1001,10 +1007,34 @@ void xtables_register_match(struct xtables_match *me)
if (me->extra_opts != NULL)
xtables_check_options(me->name, me->extra_opts);
-
- /* place on linked list of matches pending full registration */
- me->next = xtables_pending_matches;
- xtables_pending_matches = me;
+ /* order into linked list of matches pending full registration */
+ for (pos = &xtables_pending_matches; *pos; pos = &(*pos)->next) {
+ /* group by name and family */
+ if (strcmp(me->name, (*pos)->name) ||
+ me->family != (*pos)->family) {
+ if (seen_myself)
+ break; /* end of own group, append to it */
+ continue;
+ }
+ /* found own group */
+ seen_myself = true;
+ if (xtables_match_prefer(me, *pos) >= 0)
+ break; /* put preferred items first in group */
+ }
+ /* if own group was not found, prepend item */
+ if (!*pos && !seen_myself)
+ pos = &xtables_pending_matches;
+
+ me->next = *pos;
+ *pos = me;
+#ifdef DEBUG
+ printf("%s: inserted match %s (family %d, revision %d):\n",
+ __func__, me->name, me->family, me->revision);
+ for (pos = &xtables_pending_matches; *pos; pos = &(*pos)->next) {
+ printf("%s:\tmatch %s (family %d, revision %d)\n", __func__,
+ (*pos)->name, (*pos)->family, (*pos)->revision);
+ }
+#endif
}
/**
@@ -1143,6 +1173,9 @@ void xtables_register_matches(struct xtables_match *match, unsigned int n)
void xtables_register_target(struct xtables_target *me)
{
+ struct xtables_target **pos;
+ bool seen_myself = false;
+
if (me->next) {
fprintf(stderr, "%s: target \"%s\" already registered\n",
xt_params->program_name, me->name);
@@ -1198,9 +1231,33 @@ void xtables_register_target(struct xtables_target *me)
if (me->family != afinfo->family && me->family != AF_UNSPEC)
return;
- /* place on linked list of targets pending full registration */
- me->next = xtables_pending_targets;
- xtables_pending_targets = me;
+ /* order into linked list of targets pending full registration */
+ for (pos = &xtables_pending_targets; *pos; pos = &(*pos)->next) {
+ /* group by name */
+ if (!extension_cmp(me->name, (*pos)->name, (*pos)->family)) {
+ if (seen_myself)
+ break; /* end of own group, append to it */
+ continue;
+ }
+ /* found own group */
+ seen_myself = true;
+ if (xtables_target_prefer(me, *pos) >= 0)
+ break; /* put preferred items first in group */
+ }
+ /* if own group was not found, prepend item */
+ if (!*pos && !seen_myself)
+ pos = &xtables_pending_targets;
+
+ me->next = *pos;
+ *pos = me;
+#ifdef DEBUG
+ printf("%s: inserted target %s (family %d, revision %d):\n",
+ __func__, me->name, me->family, me->revision);
+ for (pos = &xtables_pending_targets; *pos; pos = &(*pos)->next) {
+ printf("%s:\ttarget %s (family %d, revision %d)\n", __func__,
+ (*pos)->name, (*pos)->family, (*pos)->revision);
+ }
+#endif
}
static bool xtables_fully_register_pending_target(struct xtables_target *me)
--
cgit v1.2.3

50
backport-libxtables-Register-multiple-extensions-in-ascending-order.patch Normal file
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@ -0,0 +1,50 @@
From b5f1a3beac1d1f2b96c8be8ebec450f5ea758090 Mon Sep 17 00:00:00 2001
From: Phil Sutter <phil@nwl.cc>
Date: Tue, 22 Sep 2020 20:01:15 +0200
Subject: libxtables: Register multiple extensions in ascending order
The newly introduced ordered insert algorithm in
xtables_register_{match,target}() works best if extensions of same name
are passed in ascending revisions. Since this is the case in about all
extensions' arrays, iterate over them from beginning to end.
Signed-off-by: Phil Sutter <phil@nwl.cc>
---
libxtables/xtables.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
diff --git a/libxtables/xtables.c b/libxtables/xtables.c
index 10d4e703..7152c657 100644
--- a/libxtables/xtables.c
+++ b/libxtables/xtables.c
@@ -1141,9 +1141,10 @@ static bool xtables_fully_register_pending_match(struct xtables_match *me,
void xtables_register_matches(struct xtables_match *match, unsigned int n)
{
- do {
- xtables_register_match(&match[--n]);
- } while (n > 0);
+ int i;
+
+ for (i = 0; i < n; i++)
+ xtables_register_match(&match[i]);
}
void xtables_register_target(struct xtables_target *me)
@@ -1269,9 +1270,10 @@ static bool xtables_fully_register_pending_target(struct xtables_target *me,
void xtables_register_targets(struct xtables_target *target, unsigned int n)
{
- do {
- xtables_register_target(&target[--n]);
- } while (n > 0);
+ int i;
+
+ for (i = 0; i < n; i++)
+ xtables_register_target(&target[i]);
}
/* receives a list of xtables_rule_match, release them */
--
cgit v1.2.3

70
backport-libxtables-Register-only-the-highest-revision-extension.patch Normal file
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@ -0,0 +1,70 @@
From 2dbb49d15fb44ddd521a734eca3be3f940b7c1ba Mon Sep 17 00:00:00 2001
From: Phil Sutter <phil@nwl.cc>
Date: Fri, 11 Feb 2022 17:39:24 +0100
Subject: libxtables: Register only the highest revision extension
When fully registering extensions, ignore all consecutive ones with same
name and family value. Since commit b3ac87038f4e4 ("libxtables: Make
sure extensions register in revision order"), one may safely assume the
list of pending extensions has highest revision numbers first. Since
iptables is only interested in the highest revision the kernel supports,
registration and compatibility checks may be skipped once the first
matching extension in pending list has validated.
Conflict: NA
Reference:
https://git.netfilter.org/iptables/commit/?id=2dbb49d15fb44ddd521a734eca3be3f940b7c1ba
Signed-off-by: Phil Sutter <phil@nwl.cc>
---
libxtables/xtables.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)
diff --git a/libxtables/xtables.c b/libxtables/xtables.c
index a3d0609..bba7fbb 100644
--- a/libxtables/xtables.c
+++ b/libxtables/xtables.c
@@ -664,6 +664,7 @@ xtables_find_match(const char *name, enum xtables_tryload tryload,
struct xtables_match **dptr;
struct xtables_match *ptr;
const char *icmp6 = "icmp6";
+ bool found = false;
if (strlen(name) >= XT_EXTENSION_MAXNAMELEN)
xtables_error(PARAMETER_PROBLEM,
@@ -682,8 +683,10 @@ xtables_find_match(const char *name, enum xtables_tryload tryload,
if (extension_cmp(name, (*dptr)->name, (*dptr)->family)) {
ptr = *dptr;
*dptr = (*dptr)->next;
- if (xtables_fully_register_pending_match(ptr, prev)) {
- prev = ptr;
+ if (!found &&
+ xtables_fully_register_pending_match(ptr, prev)) {
+ found = true;
+ prev = ptr;
continue;
} else if (prev) {
continue;
@@ -784,6 +787,7 @@ xtables_find_target(const char *name, enum xtables_tryload tryload)
struct xtables_target *prev = NULL;
struct xtables_target **dptr;
struct xtables_target *ptr;
+ bool found = false;
/* Standard target? */
if (strcmp(name, "") == 0
@@ -798,8 +802,10 @@ xtables_find_target(const char *name, enum xtables_tryload tryload)
if (extension_cmp(name, (*dptr)->name, (*dptr)->family)) {
ptr = *dptr;
*dptr = (*dptr)->next;
- if (xtables_fully_register_pending_target(ptr, prev)) {
- prev = ptr;
+ if (!found &&
+ xtables_fully_register_pending_target(ptr, prev)) {
+ found = true;
+ prev = ptr;
continue;
} else if (prev) {
continue;
--
2.23.0

241
backport-libxtables-Simplify-pending-extension-registration.patch Normal file
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@ -0,0 +1,241 @@
From a1eaaceb0460b338294e40bdd5bc5186320a478c Mon Sep 17 00:00:00 2001
From: Phil Sutter <phil@nwl.cc>
Date: Fri, 18 Sep 2020 18:48:14 +0200
Subject: libxtables: Simplify pending extension registration
Assuming that pending extensions are sorted by first name and family,
then descending revision, the decision where to insert a newly
registered extension may be simplified by memorizing the previous
registration (which obviously is of same name and family and higher
revision).
As a side-effect, fix for unsupported old extension revisions lingering
in pending extension list forever and being retried with every use of
the given extension. Any revision being rejected by the kernel may
safely be dropped iff a previous (read: higher) revision was accepted
already.
Yet another side-effect of this change is the removal of an unwanted
recursion by xtables_fully_register_pending_*() into itself via
xtables_find_*().
Signed-off-by: Phil Sutter <phil@nwl.cc>
---
libxtables/xtables.c | 130 +++++++++++--------------------------------
1 file changed, 34 insertions(+), 96 deletions(-)
diff --git a/libxtables/xtables.c b/libxtables/xtables.c
index 9a8f8fb..988a0c7 100644
--- a/libxtables/xtables.c
+++ b/libxtables/xtables.c
@@ -203,8 +203,10 @@ struct xtables_match *xtables_matches;
struct xtables_target *xtables_targets;
/* Fully register a match/target which was previously partially registered. */
-static bool xtables_fully_register_pending_match(struct xtables_match *me);
-static bool xtables_fully_register_pending_target(struct xtables_target *me);
+static bool xtables_fully_register_pending_match(struct xtables_match *me,
+ struct xtables_match *prev);
+static bool xtables_fully_register_pending_target(struct xtables_target *me,
+ struct xtables_target *prev);
/* registry for loaded shared objects to close later */
struct dlreg {
@@ -658,6 +660,7 @@ struct xtables_match *
xtables_find_match(const char *name, enum xtables_tryload tryload,
struct xtables_rule_match **matches)
{
+ struct xtables_match *prev = NULL;
struct xtables_match **dptr;
struct xtables_match *ptr;
const char *icmp6 = "icmp6";
@@ -679,8 +682,12 @@ xtables_find_match(const char *name, enum xtables_tryload tryload,
if (extension_cmp(name, (*dptr)->name, (*dptr)->family)) {
ptr = *dptr;
*dptr = (*dptr)->next;
- if (xtables_fully_register_pending_match(ptr))
- continue;
+ if (xtables_fully_register_pending_match(ptr, prev)) {
+ prev = ptr;
+ continue;
+ } else if (prev) {
+ continue;
+ }
*dptr = ptr;
}
dptr = &((*dptr)->next);
@@ -774,6 +781,7 @@ xtables_find_match_revision(const char *name, enum xtables_tryload tryload,
struct xtables_target *
xtables_find_target(const char *name, enum xtables_tryload tryload)
{
+ struct xtables_target *prev = NULL;
struct xtables_target **dptr;
struct xtables_target *ptr;
@@ -790,8 +798,12 @@ xtables_find_target(const char *name, enum xtables_tryload tryload)
if (extension_cmp(name, (*dptr)->name, (*dptr)->family)) {
ptr = *dptr;
*dptr = (*dptr)->next;
- if (xtables_fully_register_pending_target(ptr))
+ if (xtables_fully_register_pending_target(ptr, prev)) {
+ prev = ptr;
continue;
+ } else if (prev) {
+ continue;
+ }
*dptr = ptr;
}
dptr = &((*dptr)->next);
@@ -1099,64 +1111,27 @@ static int xtables_target_prefer(const struct xtables_target *a,
b->revision, b->family);
}
-static bool xtables_fully_register_pending_match(struct xtables_match *me)
+static bool xtables_fully_register_pending_match(struct xtables_match *me,
+ struct xtables_match *prev)
{
- struct xtables_match **i, *old, *pos = NULL;
+ struct xtables_match **i;
const char *rn;
- int compare;
/* See if new match can be used. */
rn = (me->real_name != NULL) ? me->real_name : me->name;
if (!compatible_match_revision(rn, me->revision))
return false;
- old = xtables_find_match(me->name, XTF_DURING_LOAD, NULL);
- while (old) {
- compare = xtables_match_prefer(old, me);
- if (compare == 0) {
- fprintf(stderr,
- "%s: match `%s' already registered.\n",
- xt_params->program_name, me->name);
- exit(1);
- }
-
- /* Now we have two (or more) options, check compatibility. */
- rn = (old->real_name != NULL) ? old->real_name : old->name;
- if (compare > 0) {
- /* Kernel tells old isn't compatible anymore??? */
- if (!compatible_match_revision(rn, old->revision)) {
- /* Delete old one. */
- for (i = &xtables_matches; *i != old;)
- i = &(*i)->next;
- *i = old->next;
- }
- pos = old;
- old = old->next;
- if (!old)
- break;
- if (!extension_cmp(me->name, old->name, old->family))
- break;
- continue;
- }
-
- /* Found right old */
- pos = old;
- break;
- }
-
- if (!pos) {
+ if (!prev) {
/* Append to list. */
for (i = &xtables_matches; *i; i = &(*i)->next);
- } else if (compare < 0) {
- /* Prepend it */
- for (i = &xtables_matches; *i != pos; i = &(*i)->next);
- } else if (compare > 0) {
+ } else {
/* Append it */
- i = &pos->next;
- pos = pos->next;
+ i = &prev->next;
+ prev = prev->next;
}
- me->next = pos;
+ me->next = prev;
*i = me;
me->m = NULL;
@@ -1262,11 +1237,11 @@ void xtables_register_target(struct xtables_target *me)
#endif
}
-static bool xtables_fully_register_pending_target(struct xtables_target *me)
+static bool xtables_fully_register_pending_target(struct xtables_target *me,
+ struct xtables_target *prev)
{
- struct xtables_target **i, *old, *pos = NULL;
+ struct xtables_target **i;
const char *rn;
- int compare;
if (strcmp(me->name, "standard") != 0) {
/* See if new target can be used. */
@@ -1275,54 +1250,17 @@ static bool xtables_fully_register_pending_target(struct xtables_target *me)
return false;
}
- old = xtables_find_target(me->name, XTF_DURING_LOAD);
- while (old) {
- compare = xtables_target_prefer(old, me);
- if (compare == 0) {
- fprintf(stderr,
- "%s: target `%s' already registered.\n",
- xt_params->program_name, me->name);
- exit(1);
- }
-
- /* Now we have two (or more) options, check compatibility. */
- rn = (old->real_name != NULL) ? old->real_name : old->name;
- if (compare > 0) {
- /* Kernel tells old isn't compatible anymore??? */
- if (!compatible_target_revision(rn, old->revision)) {
- /* Delete old one. */
- for (i = &xtables_targets; *i != old;)
- i = &(*i)->next;
- *i = old->next;
- }
- pos = old;
- old = old->next;
- if (!old)
- break;
- if (!extension_cmp(me->name, old->name, old->family))
- break;
- continue;
- }
-
- /* Found right old */
- pos = old;
- break;
- }
-
- if (!pos) {
+ if (!prev) {
/* Prepend to list. */
i = &xtables_targets;
- pos = xtables_targets;
- } else if (compare < 0) {
- /* Prepend it */
- for (i = &xtables_targets; *i != pos; i = &(*i)->next);
- } else if (compare > 0) {
+ prev = xtables_targets;
+ } else {
/* Append it */
- i = &pos->next;
- pos = pos->next;
+ i = &prev->next;
+ prev = prev->next;
}
- me->next = pos;
+ me->next = prev;
*i = me;
me->t = NULL;
--
2.23.0

69
backport-nft-Fix-EPERM-handling-for-extensions-without-rev-0.patch Normal file
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@ -0,0 +1,69 @@
From 8468fd4f7c85c21ab375402bc80d0188412b6cbf Mon Sep 17 00:00:00 2001
From: Phil Sutter <phil@nwl.cc>
Date: Wed, 4 May 2022 11:19:16 +0200
Subject: nft: Fix EPERM handling for extensions without rev 0
Treating revision 0 as compatible in EPERM case works fine as long as
there is a revision 0 of that extension defined in DSO. Fix the code for
others: Extend the EPERM handling to all revisions and keep the existing
warning for revision 0.
Conflict: NA
Reference:
https://git.netfilter.org/iptables/commit/?id=8468fd4f7c85c21ab375402bc80d0188412b6cbf
Fixes: 17534cb18ed0a ("Improve error messages for unsupported
extensions")
Signed-off-by: Phil Sutter <phil@nwl.cc>
---
iptables/nft.c | 11 +++++++----
.../shell/testcases/iptables/0008-unprivileged_0 | 7 +++++++
2 files changed, 14 insertions(+), 4 deletions(-)
diff --git a/iptables/nft.c b/iptables/nft.c
index 18bf21c..ebab3cc 100644
--- a/iptables/nft.c
+++ b/iptables/nft.c
@@ -3245,15 +3245,18 @@ int nft_compatible_revision(const char *name, uint8_t rev, int opt)
err:
mnl_socket_close(nl);
- /* pretend revision 0 is valid -
+ /* ignore EPERM and errors for revision 0 -
* this is required for printing extension help texts as user, also
* helps error messaging on unavailable kernel extension */
- if (ret < 0 && rev == 0) {
- if (errno != EPERM)
+ if (ret < 0) {
+ if (errno == EPERM)
+ return 1;
+ if (rev == 0) {
fprintf(stderr,
"Warning: Extension %s revision 0 not supported, missing kernel module?\n",
name);
- return 1;
+ return 1;
+ }
}
return ret < 0 ? 0 : 1;
}
diff --git a/iptables/tests/shell/testcases/iptables/0008-unprivileged_0 b/iptables/tests/shell/testcases/iptables/0008-unprivileged_0
index 0914c88..1f1d342 100644
--- a/iptables/tests/shell/testcases/iptables/0008-unprivileged_0
+++ b/iptables/tests/shell/testcases/iptables/0008-unprivileged_0
@@ -34,6 +34,13 @@ let "rc+=$?"
grep_or_rc "DNAT target options:" <<< "$out"
let "rc+=$?"
+# TEE has no revision 0
+out=$(run $XT_MULTI iptables -j TEE --help)
+let "rc+=$?"
+grep_or_rc "TEE target options:" <<< "$out"
+let "rc+=$?"
+
+
out=$(run $XT_MULTI iptables -p tcp -j DNAT --help)
let "rc+=$?"
grep_or_rc "tcp match options:" <<< "$out"
--
2.23.0

130
backport-xshared-Fix-response-to-unprivileged-users.patch Normal file
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@ -0,0 +1,130 @@
From 26ecdf53960658771c0fc582f72a4025e2887f75 Mon Sep 17 00:00:00 2001
From: Phil Sutter <phil@nwl.cc>
Date: Tue, 18 Jan 2022 22:39:08 +0100
Subject: xshared: Fix response to unprivileged users
Expected behaviour in both variants is:
* Print help without error, append extension help if -m and/or -j
options are present
* Indicate lack of permissions in an error message for anything else
With iptables-nft, this was broken basically from day 1. Shared use of
do_parse() then somewhat broke legacy: it started complaining about
inability to create a lock file.
Fix this by making iptables-nft assume extension revision 0 is present
if permissions don't allow to verify. This is consistent with legacy.
Second part is to exit directly after printing help - this avoids having
to make the following code "nop-aware" to prevent privileged actions.
Conflict: NA
Reference:
https://git.netfilter.org/iptables/commit/?id=26ecdf53960658771c0fc582f72a4025e2887f75
Signed-off-by: Phil Sutter <phil@nwl.cc>
Reviewed-by: Florian Westphal <fw@strlen.de>
---
iptables/nft.c | 5 ++
.../testcases/iptables/0008-unprivileged_0 | 59 +++++++++++++++++++
iptables/xtables.c | 2 +-
3 files changed, 65 insertions(+), 1 deletion(-)
create mode 100644 iptables/tests/shell/testcases/iptables/0008-unprivileged_0
diff --git a/iptables/nft.c b/iptables/nft.c
index bde4ca7..c9a4940 100644
--- a/iptables/nft.c
+++ b/iptables/nft.c
@@ -3245,6 +3245,11 @@ int nft_compatible_revision(const char *name, uint8_t rev, int opt)
err:
mnl_socket_close(nl);
+ /* pretend revision 0 is valid if not permitted to check -
+ * this is required for printing extension help texts as user */
+ if (ret < 0 && errno == EPERM && rev == 0)
+ return 1;
+
return ret < 0 ? 0 : 1;
}
diff --git a/iptables/tests/shell/testcases/iptables/0008-unprivileged_0 b/iptables/tests/shell/testcases/iptables/0008-unprivileged_0
new file mode 100644
index 0000000..0914c88
--- /dev/null
+++ b/iptables/tests/shell/testcases/iptables/0008-unprivileged_0
@@ -0,0 +1,59 @@
+#!/bin/bash
+# iptables may print match/target specific help texts
+# help output should work for unprivileged users
+
+run() {
+ echo "running: $*" >&2
+ runuser -u nobody -- "$@"
+}
+
+grep_or_rc() {
+ declare -g rc
+ grep -q "$*" && return 0
+ echo "missing in output: $*" >&2
+ return 1
+}
+
+out=$(run $XT_MULTI iptables --help)
+let "rc+=$?"
+grep_or_rc "iptables -h (print this help information)" <<< "$out"
+let "rc+=$?"
+
+out=$(run $XT_MULTI iptables -m limit --help)
+let "rc+=$?"
+grep_or_rc "limit match options:" <<< "$out"
+let "rc+=$?"
+
+out=$(run $XT_MULTI iptables -p tcp --help)
+let "rc+=$?"
+grep_or_rc "tcp match options:" <<< "$out"
+let "rc+=$?"
+
+out=$(run $XT_MULTI iptables -j DNAT --help)
+let "rc+=$?"
+grep_or_rc "DNAT target options:" <<< "$out"
+let "rc+=$?"
+
+out=$(run $XT_MULTI iptables -p tcp -j DNAT --help)
+let "rc+=$?"
+grep_or_rc "tcp match options:" <<< "$out"
+let "rc+=$?"
+out=$(run $XT_MULTI iptables -p tcp -j DNAT --help)
+let "rc+=$?"
+grep_or_rc "DNAT target options:" <<< "$out"
+let "rc+=$?"
+
+
+run $XT_MULTI iptables -L 2>&1 | \
+ grep_or_rc "Permission denied"
+let "rc+=$?"
+
+run $XT_MULTI iptables -A FORWARD -p tcp --dport 123 2>&1 | \
+ grep_or_rc "Permission denied"
+let "rc+=$?"
+
+run $XT_MULTI iptables -A FORWARD -j DNAT --to-destination 1.2.3.4 2>&1 | \
+ grep_or_rc "Permission denied"
+let "rc+=$?"
+
+exit $rc
diff --git a/iptables/xtables.c b/iptables/xtables.c
index 9779bd8..a16bba7 100644
--- a/iptables/xtables.c
+++ b/iptables/xtables.c
@@ -645,7 +645,7 @@ void do_parse(struct nft_handle *h, int argc, char *argv[],
printhelp(cs->matches);
p->command = CMD_NONE;
- return;
+ exit(0);
/*
* Option selection
--
2.23.0

17
iptables.spec
View File

@ -2,7 +2,7 @@
%global legacy_actions %{_libexecdir}/initscripts/legacy-actions
Name: iptables
Version: 1.8.5
Release: 4
Release: 5
Summary: IP packet filter administration utilities
License: GPLv2 and Artistic Licence 2.0 and ISC
URL: https://www.netfilter.org/
@ -13,6 +13,15 @@ Source3: iptables.service
Source4: sysconfig_iptables
Source5: sysconfig_ip6tables
Patch6001: backport-xshared-Fix-response-to-unprivileged-users.patch
Patch6002: backport-Improve-error-messages-for-unsupported-extensions.patch
Patch6003: backport-nft-Fix-EPERM-handling-for-extensions-without-rev-0.patch
Patch6004: backport-libxtables-Make-sure-extensions-register-in-revision-order.patch
Patch6005: backport-libxtables-Register-multiple-extensions-in-ascending-order.patch
Patch6006: backport-libxtables-Simplify-pending-extension-registration.patch
Patch6007: backport-libxtables-Register-only-the-highest-revision-extension.patch
BuildRequires: bison flex gcc kernel-headers libpcap-devel libselinux-devel systemd git
BuildRequires: libmnl-devel libnetfilter_conntrack-devel libnfnetlink-devel libnftnl-devel
BuildRequires: autogen autoconf automake libtool
@ -317,6 +326,12 @@ fi
%{_mandir}/man8/xtables-legacy*
%changelog
* Thu Mar 09 2023 zhanghao <zhanghao383@huawei.com> - 1.8.5-5
- Type: bugfix
- ID: NA
- SUG: NA
- DESC: add some patches
* Tue Sep 06 2022 huangyu <huangyu106@huawei.com> - 1.8.5-4
- Type: bugfix
- ID: NA