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* Combine parse_target() and command_jump() implementationsPhil Sutter2018-09-257-249/+80
| | | | | | | | | | | | | | | | | | | | | | | | | | | Merge these two functions from xtables, iptables, ip6tables and arptables. Both functions were basically identical in the first three, only the last one required a bit more attention. To eliminate access to 'invflags' in variant-specific location, move the call to set_option() into callers. This is actually consistent with parsing of other options in them. As with command_match(), use xt_params instead of the different *_globals objects to refer to 'opts' and 'orig_opts'. It was necessary to rename parse_target() as it otherwise clashes with a static function of same name in libxt_SET. In arptables, the maximum allowed target name is a bit larger, so introduce xtables_globals.target_maxnamelen defining the value. It is used in the shared xt_parse_target() implementation. Implementation of command_jump() in arptables diverted from the others for no obvious reason. The call to parse_target() was done outside of it and a pointer to cs->arp was passed but not used inside. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* Combine command_match() implementationsPhil Sutter2018-09-255-108/+40
| | | | | | | | | | This merges the basically identical implementations of command_match() from xtables, iptables and ip6tables into one. The only required adjustment was to make use of xt_params instead of the different *_globals objects. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* libiptc: NULL-terminate errornamePhil Sutter2018-09-251-1/+2
| | | | | | | | | | In struct chain_head, field 'name' is of size TABLE_MAXNAMELEN, hence copying its content into 'error_name' field of struct xt_error_target which is two bytes shorter may overflow. Make sure this doesn't happen by using strncpy() and set the last byte to zero. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* libxtables: Check extension real_name lengthPhil Sutter2018-09-251-0/+12
| | | | | | | Just like with 'name', if given check 'real_name' to not exceed max length. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* iptables: Gitignore xtables-{legacy, nft}-multi scriptsPhil Sutter2018-09-241-0/+2
| | | | | Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* xtables: Drop pointless checkPhil Sutter2018-09-241-1/+1
| | | | | | | | All commands this block handles set p->chain. Also the pointer is dereferenced before, so no point in checking for it to be non-NULL. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* arptables: Fix incorrect strcmp() in nft_arp_rule_find()Phil Sutter2018-09-241-1/+1
| | | | | | | | | Since nft_arp_rule_to_cs() may not set cs->jumpto, later call to strcmp() may be passed a NULL pointer. Therefore check if the pointer is valid before doing so. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* xtables: Don't read garbage in nft_ipv4_parse_payload()Phil Sutter2018-09-241-0/+1
| | | | | | | | | The problem here is that get_frag() does not set 'inv' in any case, so when later checking its value, garbage may be read. Sanitize this case by setting 'inv' to false before calling get_frag(). Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* libxtables: Use posix_spawn() instead of vfork()Phil Sutter2018-09-241-10/+5
| | | | | | | | | According to covscan, vfork() may lead to a deadlock in the parent process. It suggests to use posix_spawn() instead. Since the latter combines vfork() and exec() calls, use it for xtables_insmod(). Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* Fix a few cases of pointless assignmentsPhil Sutter2018-09-249-23/+14
| | | | | | | | This gets rid of a number of assignments which are either redundant or not used afterwards. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* extensions: libebt_ip{, 6}: Drop pointless error checkingPhil Sutter2018-09-242-8/+0
| | | | | | | | | Since info->protocol is of type __u8, its value will never become -1. Apart from that, xtables_parse_protocol() calls xt_params->exit_err() in case of error, so this code is dead anyway. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* nft-arp: Drop ineffective conditionalPhil Sutter2018-09-241-3/+0
| | | | | | | | Since fw->arp.arhln is of type __u8, its value will never become less than zero. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* iptables: Use print_ifaces() from xtablesPhil Sutter2018-09-246-99/+31
| | | | | | | | | | Move the function to xshared.c for common use between legacy and xtables sources. While being at it, silence a covscan warning triggered by that function as it couldn't verify input buffers won't exceed IFNAMSIZ. Therefore use snprintf() when writing to the local buffer. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* Share print_ipv{4,6}_addr() from xtablesPhil Sutter2018-09-246-119/+73
| | | | | | | | | | | | | | | | These functions contain code which occurs in legacy's print_firewall() functions, so use them there. Rename them to at least make clear they print more than a single address. Also introduce ipv{4,6}_addr_to_string() which take care of converting an address/netmask pair into string representation in a way which doesn't upset covscan (since that didn't detect that 'buf' may not be exceeded by the strings written into it. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* iptables-apply: Replace signal numbers by namesPhil Sutter2018-09-241-1/+2
| | | | | | | | As covscan stated: "Trapping signals by number is not well defined. Prefer signal names." Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* iptables-apply: Quote strings passed to echoPhil Sutter2018-09-241-3/+3
| | | | | | | | Not a real problem here, but covscan got confused by one string containing 'then' keyword. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* nfnl_osf: Replace deprecated nfnl_talk() by nfnl_query()Phil Sutter2018-09-241-1/+1
| | | | | | | This eliminates the deprecation warning when compiling the sources. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* libxtables: Don't read garbage in xtables_strtoui()Phil Sutter2018-09-241-1/+1
| | | | | | | | | If xtables_strtoul() fails, it returns false and data pointed to by parameter 'value' is undefined. Hence avoid copying that data in xtables_strtoui() if the call failed. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* libxtables: Avoid calling memcpy() with NULL sourcePhil Sutter2018-09-242-8/+16
| | | | | | | | | | Both affected functions check if 'oldopts' is NULL once but later seem to ignore that possibility. To catch up on that, increment the pointer only if it isn't NULL, also don't copy its content into the merged options buffer in that case. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* libiptc: Simplify alloc_handle() function signaturePhil Sutter2018-09-241-7/+7
| | | | | | | | | | | This change originated from covscan complaining about the strcpy() call with an unknown size source buffer. But in fact, the size is known (and equal to the destination size), so pass a pointer to STRUCT_GETINFO to alloc_handle() instead of it's fields separately. Hopefully this will silence covscan. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* libxt_time: Drop initialization of variable 'year'Phil Sutter2018-09-241-4/+4
| | | | | | | | | The variable is not read before being assigned the return value of strtoul(), thefore the initialization is useless. And since after this change parameter 'end' becomes unused, drop it as well. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* libxt_ipvs: Avoid potential buffer overrunPhil Sutter2018-09-241-10/+12
| | | | | | | | | Just like with libxt_conntrack, get rid of the temporary buffer. The comment even states that it was copied from there, so just make them identical again. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* libxt_conntrack: Avoid potential buffer overrunPhil Sutter2018-09-241-7/+7
| | | | | | | | | | In print_addr(), a resolved hostname is written into a buffer without size check. Since BUFSIZ is typically 8192 bytes, this shouldn't be an issue, though covscan complained about it. Fix the code by using conntrack_dump_addr() as an example. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* libxt_conntrack: Version 0 does not support XT_CONNTRACK_DIRECTIONPhil Sutter2018-09-241-8/+0
| | | | | | | | | | Since sinfo->flags is only 8 bytes large, checking for XT_CONNTRACK_DIRECTION bit (which has value 1 << 12) will always return false, so drop this dead code. Fixes: c7fc1dae1e8f8 ("libxt_conntrack: dump ctdir") Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* libxt_LED: Avoid string overrun while parsing led-trigger-idPhil Sutter2018-09-241-2/+1
| | | | | | | | Instead of using strcat() and assuming the name will fit, print into the buffer using snprintf() which truncates the string as needed. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* xtables: Remove unused variable in nft_is_table_compatible()Phil Sutter2018-09-241-1/+1
| | | | | | | | This is a leftover from previous cleanup. Fixes: 098ee2e91756c ("xtables-save: Ignore uninteresting tables") Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* ip{, 6}tables-restore: Fix for uninitialized array 'curtable'Phil Sutter2018-09-242-2/+2
| | | | | | | | | | When reading sufficiently malformed input, parser might hit end of loop without having written the current table name into curtable and therefore calling strcmp() with uninitialized buffer. Avoid this by setting curtable to zero upon declaration. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* Mark fall through cases in switch() statementsPhil Sutter2018-09-243-15/+19
| | | | | | | | | | | | Typical covscan complaint, non-empty fall throughs should be marked as such. There was but a single case which should break instead, namely in libebt_log.c: It is not critical, since the next case merely asserts 'invert' being zero (which can't be as it was checked before). But while being at it, introduce log_chk_inv() to consolidate the semantically equal cases for the various log types. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* libxtables: Integrate getethertype.c from xtables corePhil Sutter2018-09-245-144/+4
| | | | | | | | | | | | | | This moves getethertype.c into libxtables so that both extensions and xtables-nft-multi may use the implementations therein. New users are libebt_arp and libebt_vlan which drop their own duplicated implementations of getethertypebyname() for the shared one. This change originated from a covscan report of extensions' implementations not checking fopen() return value which should be implicitly fixed by this as well. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* xtables: Fix for wrong assert() in __nft_table_flush()Phil Sutter2018-09-241-1/+1
| | | | | | | | | | The code obviously tries to assert that nft_table_builtin_find() returned a valid pointer before dereferencing it, but the wrong argument was given. Assume this is just a typo and insert the missing underscore. Fixes: 9b896224e0bfc ("xtables: rework rule cache logic") Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* nfnl_osf: Drop pointless check in xt_osf_strchr()Phil Sutter2018-09-241-1/+1
| | | | | | | | | | Although it remains unclear what the original intention behind the affected code was, but 'tmp + 1' always evaluates true since 'tmp' is a pointer value. Cc: Evgeniy Polyakov <johnpol@2ka.mxt.ru> Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* libxt_string: Fix array out of bounds checkPhil Sutter2018-09-181-2/+4
| | | | | | | | | | | | | | | | | | Commit 56d7ab42f3782 ("libxt_string: Avoid potential array out of bounds access") tried to fix parse_hex_string() for overlong strings but the change still allowed for 'sindex' to become XT_STRING_MAX_PATTERN_SIZE which leads to access of first byte after info->pattern. This is not really a problem because it merely overwrites info->patlen before calling xtables_error() later, but covscan still detects it so it's still worth fixing. The crucial bit here is that 'sindex' has to be incremented at end of the last iteration since its value is used for info->patlen. Hence just move the overflow check to the beginning of the loop. Fixes: 56d7ab42f3782 ("libxt_string: Avoid potential array out of bounds access") Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* xtables-save: Ignore uninteresting tablesPhil Sutter2018-09-182-14/+9
| | | | | | | | | | | | | | | | | | When running iptables-nft-save with other tables present, the dump succeeded but the tool complained about those other tables. In an environment where iptables-nft and nftables are uses in parallel, this is an expected situation, so only complain about incompatible builtin tables. While being at it, move the table existence check from __do_output() into do_output() since the former may be called from nft_for_each_table() in which case the table is guaranteed to exist. Also use nft_table_builtin_find() in nft_is_table_compatible() instead of open-coding the search by name in h->tables. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* extensions: add cgroup revision 2Pablo Neira Ayuso2018-09-182-3/+96
| | | | | | Just like revision v1, but cgroup path field is smaller. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* extensions: REJECT: Merge reject tablesPhil Sutter2018-09-132-111/+112
| | | | | | | | | | | | Initial motivation for this was a covscan report for potential array out of bounds access in REJECT_xlate (a false-positive, because all possible values of reject->with occur in reject_table_xlate). Use reject types as array indices of reject_table so that reject->with serves as array index. Also merge reject_table_xlate into it. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* libxt_string: Avoid potential array out of bounds accessPhil Sutter2018-09-131-2/+1
| | | | | | | | | | | The pattern index variable 'sindex' is bounds checked before incrementing it, which means in the next loop iteration it might already match the bounds check condition but is used anyway. Fix this by incrementing the index before performing the bounds check. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* ebtables: Fix for potential array boundary overstepPhil Sutter2018-09-131-1/+1
| | | | | | | | Fix the parameter check in nft_ebt_standard_target() to avoid an array out of bounds access in ebt_standard_targets. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* libiptc: Avoid side-effect in memset() callsPhil Sutter2018-09-131-2/+4
| | | | | | | | | | | | | These calls to memset() are passed a length argument which exceeds t->target.u.user.name's length by one byte and hence overwrite t->target.u.user.revision as well (relying upon no padding to happen between both). Avoid this obscure behaviour by passing the correct field size and explicitly overwriting 'revision' field. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* libxtables: Fix potential array overrun in xtables_option_parse()Phil Sutter2018-09-131-1/+1
| | | | | | | | If entry->type is to be used as array index, it needs to be at max one less than that array's size. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* xtables: Accept --wait in iptables-nft-restorePhil Sutter2018-09-102-0/+23
| | | | | | | | | | | Passing --wait option to iptables-nft-restore led to program abort because the flag parameter was not skipped. Mimick iptables-restore behaviour when encountering --wait or --wait-interval options (but still ignore the parameter). Fixes: b9d7b49d84bc2 ("xtables-compat: restore: sync options with iptables-restore") Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* xtables: Don't check all rules for being compatiblePhil Sutter2018-09-101-0/+6
| | | | | | | | | | | | | Commit f8e29a13fed8d ("xtables: avoid bogus 'is incompatible' warning") fixed for compatibility checking to extend over all chains, not just the relevant ones. This patch does the same for rules: Make sure only rules belonging to the relevant table are being considered. Note that comparing the rule's table name is sufficient here since the table family is already considered when populating the rule cache. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* doc: Improve layout of u32 instructionsJoseph C. Sible2018-09-101-10/+15
| | | | | | | | Make it more clear where the instruction ends, and where what it does begins. Signed-off-by: Joseph C. Sible <josephcsible@gmail.com> Signed-off-by: Florian Westphal <fw@strlen.de>
* xtables-restore: Fix flushing referenced custom chainsPhil Sutter2018-09-102-10/+8
| | | | | | | | | | | | | | | | | | | | | | | | The logic to replicate 'iptables-restore --noflush' behaviour of flushing custom chains if listed in the dump was broken for chains being referenced. A minimal dump reproducing the issue is: | *filter | :foobar - [0:0] | -I INPUT -j foobar | -A foobar -j ACCEPT | COMMIT With --noflush, this can be restored just once in iptables-nft-restore. Consecutive attempts return an error since xtables tries to delete the referenced chain and recreate it instead of performing a real flush. Fix this by really flushing the custom chain in 'chain_user_flush' callback and running 'chain_user_add' callback only if the chain doesn't exist already. Fixes: df3d92bec6007 ("xtables-compat-restore: flush user-defined chains with -n") Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* xtables: Drop use of IP6T_F_PROTOPhil Sutter2018-09-011-4/+0
| | | | | | | | | | | | | | | | | Setting this bit in cs->fw6.ipv6.flags was done only for rules parsed from command line, not for those read from kernel. As a result, appropriate rules could not be deleted. A simple test case is: | # ip6tables-nft -A INPUT -p tcp -j ACCEPT | # ip6tables-nft -D INPUT -p tcp -j ACCEPT | iptables: Bad rule (does a matching rule exist in that chain?). Since the flag is not used anywhere in xtables-nft, dropping its use fixes the bug as well as setting it in both cases. Fixes: 5ee03e6df4172 ("xtables: Use meta l4proto for -p match") Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* xtables: Align return codes with legacy iptablesPhil Sutter2018-09-015-5/+107
| | | | | | | | Make sure return codes match legacy ones at least for a few selected commands typically used to check ruleset state. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* xtables: Fix for deleting rules with commentPhil Sutter2018-08-292-9/+21
| | | | | | | | | | | | | | | | | | | | | | Comment match allocation in command_match() and nft_rule_to_iptables_command_state() were misaligned in that the latter set match_size to just what is required instead of what the match needs at maximum like the further. This led to failure when comparing them later and therefore a rule with a comment could not be deleted. For comments of a specific length, the udata buffer is padded by libnftnl so nftnl_rule_get_data() returns a length value which is larger than the string (including NULL-byte). The trailing data is supposed to be ignored, but compare_matches() can't not know about that detail and therefore returns a false-negative if trailing data contains junk. To overcome this, use strncpy() when populating match data in nft_rule_to_iptables_command_state(). While being at it, make sure comment match allocation in that function is identical to what command_match() does with regards to data allocation size. Also use xtables_calloc() which does the required error checking. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* ip6tables-translate: Fix libip6t_mh.txlate testPhil Sutter2018-08-241-2/+2
| | | | | | | | | Layer 4 protocol name "mobility-header" is not known by nft, so it's neither printed nor accepted on input. Hence fix the test instead of code. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* ebtables-translate: Fix for libebt_limit.txlatePhil Sutter2018-08-241-1/+9
| | | | | | | | | The xlate function sharing here does not quite work since in ebtables-translate, extensions are supposed to append whitespace. Fix this by introducing a simple wrapper. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* xtables: Add missing deinitializationPhil Sutter2018-08-243-5/+8
| | | | | | | | | | These fix reports for definitely lost blocks in valgrind. Not really memleaks, but due to nft_handle going out of scope they're counted as lost. Still worth fixing though since it reduces noise when auditing code for real issues. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* ebtables: Review match/target lookup once morePhil Sutter2018-08-244-165/+58
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This is a partial revert of my previous commit with similar subject - it missed to apply the needed changes to ebtables-translate as well and on top of that still left some leaks and use-after-frees in place. The new strategy is to make ebtables extension loading compatible with that of xtables, because otherwise the heavy code sharing between ebtables-translate and iptables-translate will cause trouble. Basically, ebt_add_match() and ebt_add_watcher() copy what xtables' command_match() does, but after the actual extension argument parsing has already happened. Therefore they duplicate the loaded match along with its data and reset the original one to default state for being reused (e.g., by ebtables-restore). Since mflags/tflags are cleared while doing so, clearing them for all loaded extensions in do_commandeb() is not necessary anymore. In ebt_command_default() (where extension parameter parsing happens), the list of added extensions to the current rule are consolidated first so no duplicate extension loading happens. With the above in place, ebt_cs_clean() can be reverted to its old state. Apart from sharing command_jump() function with ebtables-translate, make use of nft_init_eb() there, as well. Fixes: aa7fb04fcf72c ("ebtables: Review match/target lookup") Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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