113 lines
3.7 KiB
Diff
113 lines
3.7 KiB
Diff
From 257c18bf4fbcc7e5f4fb3c9cadab699986a9bd41 Mon Sep 17 00:00:00 2001
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From: Phil Sutter <phil@nwl.cc>
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Date: Wed, 16 Mar 2022 17:14:07 +0100
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Subject: [PATCH] nft: Reject standard targets as chain names when restoring
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Reuse parse_chain() called from do_parse() for '-N' and rename it for a
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better description of what it does.
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Note that by itself, this patch will likely kill iptables-restore
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performance for big rulesets due to the extra extension lookup for chain
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lines. A following patch announcing those chains to libxtables will
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alleviate that.
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Signed-off-by: Phil Sutter <phil@nwl.cc>
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Reviewed-by: Florian Westphal <fw@strlen.de>
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(cherry picked from commit b1aee6b2238794446feba41778f88703784560f7)
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Conflicts:
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iptables/xshared.c
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-> Parts manually applied due to unmerged do_parse() function.
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---
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iptables/ip6tables.c | 2 +-
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iptables/iptables.c | 2 +-
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iptables/xshared.c | 2 +-
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iptables/xshared.h | 2 +-
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iptables/xtables-restore.c | 5 +----
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iptables/xtables.c | 2 +-
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6 files changed, 6 insertions(+), 9 deletions(-)
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diff --git a/iptables/ip6tables.c b/iptables/ip6tables.c
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index 614d1e249c06d..b96dc033e7ebb 100644
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--- a/iptables/ip6tables.c
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+++ b/iptables/ip6tables.c
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@@ -1247,7 +1247,7 @@ int do_command6(int argc, char *argv[], char **table,
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break;
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case 'N':
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- parse_chain(optarg);
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+ assert_valid_chain_name(optarg);
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add_command(&command, CMD_NEW_CHAIN, CMD_NONE,
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cs.invert);
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chain = optarg;
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diff --git a/iptables/iptables.c b/iptables/iptables.c
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index 3b395981cc8ea..6e2946f5660de 100644
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--- a/iptables/iptables.c
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+++ b/iptables/iptables.c
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@@ -1243,7 +1243,7 @@ int do_command4(int argc, char *argv[], char **table,
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break;
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case 'N':
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- parse_chain(optarg);
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+ assert_valid_chain_name(optarg);
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add_command(&command, CMD_NEW_CHAIN, CMD_NONE,
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cs.invert);
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chain = optarg;
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diff --git a/iptables/xshared.c b/iptables/xshared.c
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index de8326b6c7b05..0c232ca2ae8d5 100644
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--- a/iptables/xshared.c
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+++ b/iptables/xshared.c
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@@ -776,7 +776,7 @@ int parse_rulenumber(const char *rule)
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return rulenum;
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}
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-void parse_chain(const char *chainname)
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+void assert_valid_chain_name(const char *chainname)
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{
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const char *ptr;
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diff --git a/iptables/xshared.h b/iptables/xshared.h
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index f5d2f8d0a2bc5..095a574d85879 100644
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--- a/iptables/xshared.h
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+++ b/iptables/xshared.h
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@@ -217,6 +217,6 @@ char cmd2char(int option);
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void add_command(unsigned int *cmd, const int newcmd,
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const int othercmds, int invert);
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int parse_rulenumber(const char *rule);
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-void parse_chain(const char *chainname);
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+void assert_valid_chain_name(const char *chainname);
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#endif /* IPTABLES_XSHARED_H */
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diff --git a/iptables/xtables-restore.c b/iptables/xtables-restore.c
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index c472ac9bf651b..a078da32045dc 100644
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--- a/iptables/xtables-restore.c
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+++ b/iptables/xtables-restore.c
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@@ -150,10 +150,7 @@ static void xtables_restore_parse_line(struct nft_handle *h,
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"%s: line %u chain name invalid\n",
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xt_params->program_name, line);
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- if (strlen(chain) >= XT_EXTENSION_MAXNAMELEN)
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- xtables_error(PARAMETER_PROBLEM,
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- "Invalid chain name `%s' (%u chars max)",
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- chain, XT_EXTENSION_MAXNAMELEN - 1);
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+ assert_valid_chain_name(chain);
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policy = strtok(NULL, " \t\n");
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DEBUGP("line %u, policy '%s'\n", line, policy);
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diff --git a/iptables/xtables.c b/iptables/xtables.c
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index 3ea293ee7c411..9006962472c58 100644
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--- a/iptables/xtables.c
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+++ b/iptables/xtables.c
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@@ -668,7 +668,7 @@ void do_parse(struct nft_handle *h, int argc, char *argv[],
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break;
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case 'N':
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- parse_chain(optarg);
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+ assert_valid_chain_name(optarg);
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add_command(&p->command, CMD_NEW_CHAIN, CMD_NONE,
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cs->invert);
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p->chain = optarg;
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--
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2.34.1
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