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detect: Improve support for larger address values. #5619

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detect: Improve support for larger address values. #5619

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5695c1b
detect/address: Improve support for large addrs
jlucovsky Oct 17, 2020
350c51a
general: Typo cleanup
jlucovsky Oct 17, 2020
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242 changes: 220 additions & 22 deletions src/detect-engine-address.c
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Original file line number Diff line number Diff line change
Expand Up @@ -54,6 +54,10 @@ static void DetectAddressPrint(DetectAddress *);
static int DetectAddressCutNot(DetectAddress *, DetectAddress **);
static int DetectAddressCut(DetectEngineCtx *, DetectAddress *, DetectAddress *,
DetectAddress **);
static int DetectAddressParse2(const DetectEngineCtx *de_ctx, DetectAddressHead *gh,
DetectAddressHead *ghn, const char *s, int negate, ResolvedVariablesList *var_list,
int recur);

int DetectAddressMergeNot(DetectAddressHead *gh, DetectAddressHead *ghn);

/**
Expand Down Expand Up @@ -715,6 +719,10 @@ static int DetectAddressSetup(DetectAddressHead *gh, const char *s)
* \brief Parses an address string and updates the 2 address heads with the
* address data.
*
* Note that this function should only be called by the wrapping function
* DetectAddressParse2. The wrapping function provides long address handling
* when the address size exceeds a threshold value.
*
* \todo We don't seem to be handling negated cases, like [addr,![!addr,addr]],
* since we pass around negate without keeping a count of ! with depth.
* Can solve this by keeping a count of the negations with depth, so that
Expand All @@ -733,17 +741,14 @@ static int DetectAddressSetup(DetectAddressHead *gh, const char *s)
* \retval 0 On successfully parsing.
* \retval -1 On failure.
*/
static int DetectAddressParse2(const DetectEngineCtx *de_ctx,
DetectAddressHead *gh, DetectAddressHead *ghn,
const char *s, int negate, ResolvedVariablesList *var_list,
int recur)
static int DetectAddressParseInternal(const DetectEngineCtx *de_ctx, DetectAddressHead *gh,
DetectAddressHead *ghn, const char *s, int negate, ResolvedVariablesList *var_list,
int recur, char *address, size_t address_length)
{
size_t x = 0;
size_t u = 0;
int o_set = 0, n_set = 0, d_set = 0;
int depth = 0;
size_t size = strlen(s);
char address[8196] = "";
const char *rule_var_address = NULL;
char *temp_rule_var_address = NULL;

Expand All @@ -755,11 +760,13 @@ static int DetectAddressParse2(const DetectEngineCtx *de_ctx,

SCLogDebug("s %s negate %s", s, negate ? "true" : "false");

for (u = 0, x = 0; u < size && x < sizeof(address); u++) {
if (x == (sizeof(address) - 1)) {
SCLogError(SC_ERR_ADDRESS_ENGINE_GENERIC, "Hit the address buffer"
" limit for the supplied address. Invalidating sig. "
"Please file a bug report on this.");
size_t size = strlen(s);
for (u = 0, x = 0; u < size && x < address_length; u++) {
if (x == (address_length - 1)) {
SCLogError(SC_ERR_ADDRESS_ENGINE_GENERIC,
"Hit the address buffer"
" limit for the supplied address. Invalidating sig. "
"Please file a bug report on this.");
goto error;
}
address[x] = s[u];
Expand Down Expand Up @@ -894,10 +901,8 @@ static int DetectAddressParse2(const DetectEngineCtx *de_ctx,
goto error;
}


if (DetectAddressParse2(de_ctx, gh, ghn, temp_rule_var_address,
(negate + n_set) % 2, var_list, recur) < 0)
{
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(negate + n_set) % 2, var_list, recur) < 0) {
if (temp_rule_var_address != rule_var_address)
SCFree(temp_rule_var_address);
goto error;
Expand All @@ -923,11 +928,7 @@ static int DetectAddressParse2(const DetectEngineCtx *de_ctx,
} else if (depth == 0 && s[u] == '$') {
d_set = 1;
} else if (depth == 0 && u == size - 1) {
if (x == sizeof(address)) {
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address[x - 1] = '\0';
} else {
address[x] = '\0';
}
address[x] = '\0';
x = 0;

if (AddVariableToResolveList(var_list, address) == -1) {
Expand Down Expand Up @@ -964,7 +965,7 @@ static int DetectAddressParse2(const DetectEngineCtx *de_ctx,
}

if (DetectAddressParse2(de_ctx, gh, ghn, temp_rule_var_address,
(negate + n_set) % 2, var_list, recur) < 0) {
(negate + n_set) % 2, var_list, recur) < 0) {
SCLogDebug("DetectAddressParse2 hates us");
if (temp_rule_var_address != rule_var_address)
SCFree(temp_rule_var_address);
Expand Down Expand Up @@ -1009,6 +1010,38 @@ static int DetectAddressParse2(const DetectEngineCtx *de_ctx,
return -1;
}

/**
* \internal
* \brief Wrapper function for address parsing to minimize heap allocs during address parsing.
*
* \retval Return value from DetectAddressParse2
*/
static int DetectAddressParse2(const DetectEngineCtx *de_ctx, DetectAddressHead *gh,
DetectAddressHead *ghn, const char *s, int negate, ResolvedVariablesList *var_list,
int recur)
{
int rc;
#define MAX_ADDRESS_LENGTH 8192

size_t address_length = strlen(s);
if (address_length > (MAX_ADDRESS_LENGTH - 1)) {
char *address = SCCalloc(1, address_length);
if (address == NULL) {
SCLogError(SC_ERR_ADDRESS_ENGINE_GENERIC, "Unable to allocate"
" memory for address parsing.");
return -1;
}
rc = DetectAddressParseInternal(
de_ctx, gh, ghn, s, negate, var_list, recur, address, address_length);
SCFree(address);
} else {
char address[MAX_ADDRESS_LENGTH] = "";
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rc = DetectAddressParseInternal(
de_ctx, gh, ghn, s, negate, var_list, recur, address, MAX_ADDRESS_LENGTH);
}
return rc;
}

/**
* \internal
* \brief See if the addresses and ranges in an address head cover the
Expand Down Expand Up @@ -1258,7 +1291,8 @@ int DetectAddressTestConfVars(void)
goto error;
}

int r = DetectAddressParse2(NULL, gh, ghn, seq_node->val, /* start with negate no */0, &var_list, 0);
int r = DetectAddressParse2(
NULL, gh, ghn, seq_node->val, /* start with negate no */ 0, &var_list, 0);

CleanVariableResolveList(&var_list);

Expand Down Expand Up @@ -1419,7 +1453,7 @@ int DetectAddressParse(const DetectEngineCtx *de_ctx,
return -1;
}

int r = DetectAddressParse2(de_ctx, gh, ghn, str, /* start with negate no */0, NULL, 0);
int r = DetectAddressParse2(de_ctx, gh, ghn, str, /* start with negate no */ 0, NULL, 0);
if (r < 0) {
SCLogDebug("DetectAddressParse2 returned %d", r);
DetectAddressHeadFree(ghn);
Expand Down Expand Up @@ -4830,6 +4864,169 @@ static int AddressConfVarsTest05(void)
return result;
}

static int AddressConfVarsTest06(void)
{
// HOME_NET value size = 10261 bytes
static const char *dummy_conf_string =
"%YAML 1.1\n"
"---\n"
"\n"
"vars:\n"
"\n"
" address-groups:\n"
"\n"
" HOME_NET: "
"\"[2002:0000:3238:DFE1:63:0000:0000:FEFB,2002:0000:3238:DFE1:63:0000:0000:FEFB,"
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"2002:0000:3238:DFE1:63:0000:0000:FEFB,2003:0000:3238:DFE1:63:0000:0000:FEFB,"
"2002:0000:3238:DFE1:63:0000:0000:FEFB,2003:0000:3238:DFE1:63:0000:0000:FEFB,"
"2002:0000:3238:DFE1:63:0000:0000:FEFB,2003:0000:3238:DFE1:63:0000:0000:FEFB,"
"2002:0000:3238:DFE1:63:0000:0000:FEFB,2003:0000:3238:DFE1:63:0000:0000:FEFB,"
"2002:0000:3238:DFE1:63:0000:0000:FEFB,2003:0000:3238:DFE1:63:0000:0000:FEFB]\"\n"
"\n"
" EXTERNAL_NET: \"any\"\n"
"\n";

ConfCreateContextBackup();
ConfInit();
ConfYamlLoadString(dummy_conf_string, strlen(dummy_conf_string));

FAIL_IF(0 != DetectAddressTestConfVars());

ConfDeInit();
ConfRestoreContextBackup();

PASS;
}

#endif /* UNITTESTS */

void DetectAddressTests(void)
Expand Down Expand Up @@ -5032,5 +5229,6 @@ void DetectAddressTests(void)
UtRegisterTest("AddressConfVarsTest03 ", AddressConfVarsTest03);
UtRegisterTest("AddressConfVarsTest04 ", AddressConfVarsTest04);
UtRegisterTest("AddressConfVarsTest05 ", AddressConfVarsTest05);
UtRegisterTest("AddressConfVarsTest06 ", AddressConfVarsTest06);
#endif /* UNITTESTS */
}