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re_operators.c
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/*
* ModSecurity for Apache 2.x, http://www.modsecurity.org/
* Copyright (c) 2004-2023 Trustwave Holdings, Inc. (http://www.trustwave.com/)
*
* You may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* If any of the files related to licensing are missing or if you have any
* other questions related to licensing please contact Trustwave Holdings, Inc.
* directly using the email address security@modsecurity.org.
*/
#include "modsecurity.h"
#include "re.h"
#include "msc_pcre.h"
#include "msc_geo.h"
#include "msc_gsb.h"
#include "apr_lib.h"
#include "apr_strmatch.h"
#include "acmp.h"
#include "msc_util.h"
#include "msc_tree.h"
#include "msc_crypt.h"
#include "msc_remote_rules.h"
#include "msc_status_engine.h"
#include <apr_sha1.h>
#if APR_HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef WITH_SSDEEP
#include "fuzzy.h"
#endif
#include "libinjection/libinjection.h"
/**
*
*/
void msre_engine_op_register(msre_engine *engine, const char *name,
fn_op_param_init_t fn1, fn_op_execute_t fn2)
{
assert(engine != NULL);
assert(name != NULL);
msre_op_metadata *metadata = (msre_op_metadata *)apr_pcalloc(engine->mp,
sizeof(msre_op_metadata));
if (metadata == NULL) return;
metadata->name = name;
metadata->param_init = fn1;
metadata->execute = fn2;
apr_table_setn(engine->operators, name, (void *)metadata);
}
/**
*
*/
msre_op_metadata *msre_engine_op_resolve(msre_engine *engine, const char *name) {
assert(engine != NULL);
return (msre_op_metadata *)apr_table_get(engine->operators, name);
}
/* -- Operators -- */
/* unconditionalMatch */
static int msre_op_unconditionalmatch_execute(modsec_rec *msr, msre_rule *rule,
msre_var *var, char **error_msg)
{
assert(error_msg != NULL);
*error_msg = "Unconditional match in SecAction.";
/* Always match. */
return 1;
}
/* noMatch */
static int msre_op_nomatch_execute(modsec_rec *msr, msre_rule *rule,
msre_var *var, char **error_msg)
{
assert(error_msg != NULL);
*error_msg = "No match.";
/* Never match. */
return 0;
}
/* ipmatch */
/**
* \brief Init function to ipmatch operator
*
* \param rule ModSecurity rule struct
* \param error_msg Error message
*
* \retval 1 On Success
* \retval 0 On Fail
*/
static int msre_op_ipmatch_param_init(msre_rule *rule, char **error_msg) {
assert(rule != NULL);
assert(error_msg != NULL);
// Normally useless code, left to be safe for the moment
if (error_msg == NULL) {
ap_log_perror(APLOG_MARK, APLOG_EMERG, 0, rule->ruleset->mp, "msre_op_ipmatch_param_init: error_msg is NULL");
return -1;
}
char *param = NULL;
int res = 0;
*error_msg = NULL;
param = apr_pstrdup(rule->ruleset->mp, rule->op_param);
res = ip_tree_from_param(rule->ruleset->mp, param, &rule->ip_op,
error_msg);
if (res)
return 0;
return 1;
}
/**
* \brief Execution function to ipmatch operator
*
* \param msr Pointer internal modsec request structure
* \param rule Pointer to the rule
* \param var Pointer to variable structure
* \param error_msg Pointer to error msg
*
* \retval -1 On Failure
* \retval 1 On Match
* \retval 0 On No Match
*/
static int msre_op_ipmatch_execute(modsec_rec *msr, msre_rule *rule, msre_var *var, char **error_msg) {
assert(msr != NULL);
assert(var != NULL);
assert(error_msg != NULL);
TreeRoot *rtree = NULL;
int res = 0;
*error_msg = NULL;
if (rule == NULL || rule->ip_op == NULL) {
msr_log(msr, 1, "ipMatch Internal Error: ipmatch value is null.");
return 0;
}
rtree = rule->ip_op;
res = tree_contains_ip(msr->mp, rtree, var->value, NULL, error_msg);
if (res < 0) {
msr_log(msr, 1, "%s", *error_msg);
*error_msg = NULL;
}
if (res > 0) {
*error_msg = apr_psprintf(msr->mp, "IPmatch: \"%s\" matched at %s.", var->value, var->name);
}
return res;
}
/**
* \brief Init function to ipmatchFromFile operator
*
* \param rule Pointer to the rule
* \param error_msg Pointer to error msg
*
* \retval 1 On Success
* \retval 0 On Fail
*/
static int msre_op_ipmatchFromFile_param_init(msre_rule *rule, char **error_msg) {
assert(rule != NULL);
assert(error_msg != NULL);
const char *rootpath = NULL;
const char *filepath = NULL;
const char *ipfile_path = NULL;
char *fn = NULL;
int res = 0;
TreeRoot *rtree = NULL;
if ((rule->op_param == NULL) || (strlen(rule->op_param) == 0))
{
*error_msg = apr_psprintf(rule->ruleset->mp, "Missing parameter for " \
"operator 'ipmatchFromFile'.");
return 0;
}
fn = apr_pstrdup(rule->ruleset->mp, rule->op_param);
while ((apr_isspace(*fn) != 0) && (*fn != '\0'))
{
fn++;
}
if (*fn == '\0') {
*error_msg = apr_psprintf(rule->ruleset->mp, "Empty file specification " \
"for operator ipmatchFromFile \"%s\"", fn);
return 0;
}
filepath = fn;
if (strlen(fn) > strlen("http://") &&
strncmp(fn, "http://", strlen("http://")) == 0)
{
*error_msg = apr_psprintf(rule->ruleset->mp, "HTTPS address or file " \
"path are expected for operator ipmatchFromFile \"%s\"", fn);
return 0;
}
else if (strlen(fn) > strlen("https://") &&
strncmp(fn, "https://", strlen("https://")) == 0)
{
#ifdef WITH_CURL
res = ip_tree_from_uri(&rtree, fn, rule->ruleset->mp, error_msg);
if (res == -2)
{
/* Failed to download but we won't stop the webserver to start. */
return 1;
}
else if (res)
{
return 0;
}
#else
*error_msg = apr_psprintf(rule->ruleset->mp, "ModSecurity was not " \
"compiled with Curl support, it cannot load: \"%s\"", fn);
return 0;
#endif
}
else
{
ipfile_path = apr_pstrndup(rule->ruleset->mp, rule->filename,
strlen(rule->filename) - strlen(apr_filepath_name_get(rule->filename)));
if (apr_filepath_root(&rootpath, &filepath, APR_FILEPATH_TRUENAME,
rule->ruleset->mp) != APR_SUCCESS) {
apr_filepath_merge(&fn, ipfile_path, fn, APR_FILEPATH_TRUENAME, rule->ruleset->mp);
}
res = ip_tree_from_file(&rtree, fn, rule->ruleset->mp, error_msg);
if (res)
{
return 0;
}
}
rule->op_param_data = rtree;
return 1;
}
/**
* \brief Execution function to ipmatchFromFile operator
*
* \param msr Pointer internal modsec request structure
* \param rule Pointer to the rule
* \param var Pointer to variable structure
* \param error_msg Pointer to error msg
*
* \retval -1 On Failure
* \retval 1 On Match
* \retval 0 On No Match
*/
static int msre_op_ipmatchFromFile_execute(modsec_rec *msr, msre_rule *rule,
msre_var *var, char **error_msg) {
assert(msr != NULL);
assert(rule != NULL);
assert(var != NULL);
assert(error_msg != NULL);
TreeRoot *rtree = (TreeRoot *)rule->op_param_data;
int res = 0;
*error_msg = NULL;
if (rtree == NULL)
{
if (msr->txcfg->debuglog_level >= 6)
{
msr_log(msr, 1, "ipMatchFromFile: tree value is null.");
}
return 0;
}
if (msr->txcfg->debuglog_level >= 4) {
msr_log(msr, 4, "IPmatchFromFile: Total tree entries: %d, ipv4 %d " \
"ipv6 %d", rtree->ipv4_tree->count+rtree->ipv6_tree->count,
rtree->ipv4_tree->count, rtree->ipv6_tree->count);
}
res = tree_contains_ip(msr->mp, rtree, var->value, msr,
error_msg);
if (res < 0)
msr_log(msr, 9, "%s", *error_msg);
if (res > 0)
*error_msg = apr_psprintf(msr->mp, "IPmatchFromFile: \"%s\" matched at " \
"%s.", var->value, var->name);
return res;
}
/* rsub */
static char *param_remove_escape(msre_rule *rule, char *str, int len) {
assert(rule != NULL);
assert(str != NULL);
char *parm = apr_pcalloc(rule->ruleset->mp, len);
char *ret = parm;
for(;*str!='\0';str++) {
if(*str != '\\') {
*parm++ = *str;
} else {
str++;
if(*str != '/') {
str--;
*parm++ = *str;
} else {
*parm++ = *str;
}
}
}
*parm = '\0';
return ret;
}
/**
* \brief Init function to rsub operator
*
* \param rule Pointer to the rule
* \param error_msg Pointer to error msg
*
* \retval 1 On Success
* \retval 0 On Fail
*/
#if !defined(MSC_TEST)
static int msre_op_rsub_param_init(msre_rule *rule, char **error_msg) {
assert(rule != NULL);
assert(rule->ruleset != NULL);
assert(error_msg != NULL);
// Normally useless code, left to be safe for the moment
if (error_msg == NULL) {
ap_log_perror(APLOG_MARK, APLOG_EMERG, 0, rule->ruleset->mp, "msre_op_rsub_param_init: error_msg is NULL");
return -1;
}
#if AP_SERVER_MAJORVERSION_NUMBER > 1 && AP_SERVER_MINORVERSION_NUMBER > 0
ap_regex_t *regex;
#else
regex_t *regex;
#endif
const char *pattern = NULL;
const char *line = NULL;
char *reg_pattern = NULL;
char *replace = NULL;
char *e_pattern = NULL;
char *parsed_replace = NULL;
char *flags = NULL;
char *data = NULL;
char delim;
int ignore_case = 0;
unsigned short int op_len = 0;
*error_msg = NULL;
line = rule->op_param;
if (apr_tolower(*line) != 's') {
*error_msg = apr_psprintf(rule->ruleset->mp, "Error rsub operator format, must be s/ pattern");
return -1;
}
data = apr_pstrdup(rule->ruleset->mp, line);
delim = *++data;
if (delim)
reg_pattern = ++data;
if (reg_pattern) {
if (*data != delim) {
for(;*data != '\0' ;data++) {
if(*data == delim) {
data--;
if(*data == '\\') {
data++;
continue;
}
break;
}
}
}
if (*data) {
*++data = '\0';
++data;
replace = data;
}
}
if (replace) {
if (*data != delim) {
for(;*data != '\0' ;data++) {
if(*data == delim) {
data--;
if(*data == '\\') {
data++;
continue;
}
break;
}
}
}
if (*data) {
*++data = '\0';
flags = ++data;
}
}
if (!delim || !reg_pattern || !replace) {
*error_msg = apr_psprintf(rule->ruleset->mp, "Error rsub operator format - must be s/regex/str/[flags]");
return -1;
}
op_len = strlen(replace);
parsed_replace = apr_pstrdup(rule->ruleset->mp, parse_pm_content(param_remove_escape(rule, replace, strlen(replace)),
op_len, rule, error_msg));
if(!parsed_replace) {
*error_msg = apr_psprintf(rule->ruleset->mp, "Error rsub operator parsing input data");
return -1;
}
rule->sub_str = apr_pstrmemdup(rule->ruleset->mp, parsed_replace, strlen(parsed_replace));
if (flags) {
while (*flags) {
delim = apr_tolower(*flags);
if (delim == 'i')
ignore_case = 1;
else if (delim == 'd')
rule->escape_re = 1;
else
*error_msg = apr_psprintf(rule->ruleset->mp, "Regex flag not supported");
flags++;
}
}
e_pattern = param_remove_escape(rule, reg_pattern, strlen(reg_pattern));
pattern = apr_pstrndup(rule->ruleset->mp, e_pattern, strlen(e_pattern));
if(strstr(pattern,"%{") == NULL) {
#if AP_SERVER_MAJORVERSION_NUMBER > 1 && AP_SERVER_MINORVERSION_NUMBER > 0
regex = ap_pregcomp(rule->ruleset->mp, pattern, AP_REG_EXTENDED |
(ignore_case ? AP_REG_ICASE : 0));
#else
regex = ap_pregcomp(rule->ruleset->mp, pattern, REG_EXTENDED |
(ignore_case ? REG_ICASE : 0));
#endif
rule->sub_regex = regex;
} else {
rule->re_precomp = 1;
rule->re_str = apr_pstrndup(rule->ruleset->mp, pattern, strlen(pattern));
rule->sub_regex = NULL;
}
return 1; /* OK */
}
/**
* \brief Execution function to rsub operator
*
* \param msr Pointer internal modsec request structure
* \param rule Pointer to the rule
* \param var Pointer to variable structure
* \param error_msg Pointer to error msg
*
* \retval -1 On Failure
* \retval 1 On Match
* \retval 0 On No Match
*/
static int msre_op_rsub_execute(modsec_rec *msr, msre_rule *rule, msre_var *var, char **error_msg) {
assert(msr != NULL);
assert(rule != NULL);
assert(var != NULL);
assert(error_msg != NULL);
msc_string *str = (msc_string *)apr_pcalloc(msr->mp, sizeof(msc_string));
if (!str) {
msr_log(msr, 1, "rsub: Memory allocation error");
return -1;
}
msc_string *re_pattern = (msc_string *)apr_pcalloc(msr->mp, sizeof(msc_string));
if (!re_pattern) {
msr_log(msr, 1, "rsub: Memory allocation error");
return -1;
}
char *offset = NULL;
char *data = NULL, *pattern = NULL;
char *data_out = NULL;
unsigned int size = 0;
unsigned int maxsize=0;
int output_body = 0, input_body = 0, sl;
#if AP_SERVER_MAJORVERSION_NUMBER > 1 && AP_SERVER_MINORVERSION_NUMBER > 0
ap_regmatch_t pmatch[AP_MAX_REG_MATCH];
#else
regmatch_t pmatch[AP_MAX_REG_MATCH];
#endif
*error_msg = NULL;
if(strcmp(var->name,"STREAM_OUTPUT_BODY") == 0 ) {
output_body = 1;
} else if(strcmp(var->name,"STREAM_INPUT_BODY") == 0 ) {
input_body = 1;
} else {
msr_log(msr,9,"Operator rsub only works with STREAM_* variables");
return -1;
}
if(rule->re_precomp == 1) {
re_pattern->value = apr_pstrndup(msr->mp, rule->re_str, strlen(rule->re_str));
re_pattern->value_len = strlen(re_pattern->value);
expand_macros(msr, re_pattern, rule, msr->mp);
if(strlen(re_pattern->value) > 0) {
if(rule->escape_re == 1) {
pattern = log_escape_re(msr->mp, re_pattern->value);
if (msr->txcfg->debuglog_level >= 6) {
msr_log(msr, 6, "Escaping pattern [%s]",pattern);
}
#if AP_SERVER_MAJORVERSION_NUMBER > 1 && AP_SERVER_MINORVERSION_NUMBER > 0
rule->sub_regex = ap_pregcomp(msr->mp, pattern, AP_REG_EXTENDED);
#else
rule->sub_regex = ap_pregcomp(msr->mp, pattern, REG_EXTENDED);
#endif
} else {
#if AP_SERVER_MAJORVERSION_NUMBER > 1 && AP_SERVER_MINORVERSION_NUMBER > 0
rule->sub_regex = ap_pregcomp(msr->mp, re_pattern->value, AP_REG_EXTENDED);
#else
rule->sub_regex = ap_pregcomp(msr->mp, re_pattern->value, REG_EXTENDED);
#endif
}
} else {
rule->sub_regex = NULL;
}
}
if(rule->sub_regex == NULL) {
*error_msg = "Internal Error: regex data is null.";
return -1;
}
str->value = apr_pstrndup(msr->mp, rule->sub_str, strlen(rule->sub_str));
str->value_len = strlen(str->value);
if(strstr(rule->sub_str,"%{") != NULL)
expand_macros(msr, str, rule, msr->mp);
maxsize=var->value_len+(AP_MAX_REG_MATCH*1024)+1;
nextround:
data = apr_pcalloc(msr->mp, maxsize+1);
if(data == NULL) {
*error_msg = "Internal Error: cannot allocate memory";
return -1;
}
data_out=data;
size=0;
for (offset = (char*)var->value; !ap_regexec(rule->sub_regex, offset, AP_MAX_REG_MATCH, pmatch, 0); ) {
//Copy of data before the regex match
int i;
int s = pmatch [0].rm_so;
int p_len=pmatch [0].rm_eo - pmatch [0].rm_so;
if (size+s>maxsize) {
maxsize*=2;
goto nextround;
}
memcpy(data_out,offset,s);
data_out+=s;
size+=s;
//Copy of regex match with replacing data \1..\9
for(i=0;i<str->value_len;) {
char *x = str->value+i;
if (*x == '\\' && *(x + 1) > '0' && *(x + 1) <= '9') {
int capture=*(x + 1) - 48;
int capture_len=pmatch[capture].rm_eo-pmatch[capture].rm_so;
if (size+capture_len>maxsize)
{
maxsize*=2;
goto nextround;
}
memcpy(data_out,offset+pmatch[capture].rm_so,capture_len);
data_out+= capture_len;
size+=capture_len;
i+=2;
} else {
if (size+1>maxsize) {
maxsize*=2;
goto nextround;
}
*data_out=*(str->value+i);
data_out++;
size++;
i++;
}
}
offset+=s;
offset+=p_len;
}
//Copy of data after the last regex match
sl = strlen(offset);
if (size+sl>maxsize) {
maxsize*=2;
goto nextround;
}
memcpy(data_out,offset,sl);
data_out+=sl;
size+=sl;
*data_out=0;
if (msr->stream_output_data != NULL && output_body == 1) {
free(msr->stream_output_data);
msr->stream_output_data = NULL;
msr->stream_output_length = 0;
msr->stream_output_data = (char *)malloc(size+1);
if (msr->stream_output_data == NULL) return -1;
msr->stream_output_length = size;
msr->of_stream_changed = 1;
memcpy(msr->stream_output_data, data, size);
msr->stream_output_data[size] = '\0';
var->value_len = size;
var->value = msr->stream_output_data;
}
if (msr->stream_input_data != NULL && input_body == 1) {
free(msr->stream_input_data);
msr->stream_input_data = NULL;
msr->stream_input_length = 0;
#ifdef MSC_LARGE_STREAM_INPUT
msr->stream_input_allocated_length = 0;
#endif
msr->stream_input_data = (char *)malloc(size+1);
if(msr->stream_input_data == NULL) return -1;
msr->stream_input_length = size;
#ifdef MSC_LARGE_STREAM_INPUT
msr->stream_input_allocated_length = size;
#endif
msr->if_stream_changed = 1;
memcpy(msr->stream_input_data, data, size);
msr->stream_input_data[size] = '\0';
var->value_len = size;
var->value = msr->stream_input_data;
}
if (! *error_msg) {
*error_msg = apr_psprintf(msr->mp, "Operator rsub succeeded.");
}
return 1;
}
#endif /* MSC_TEST */
/**
* \brief Init function to validateHash
*
* \param rule ModSecurity rule struct
* \param error_msg Error message
*
* \retval 1 On success
* \retval 0 On fail
*/
static int msre_op_validateHash_param_init(msre_rule *rule, char **error_msg) {
assert(rule != NULL);
assert(error_msg != NULL);
const char *errptr = NULL;
int erroffset;
msc_regex_t *regex;
const char *pattern = rule->op_param;
#ifdef WITH_PCRE_STUDY
#ifdef WITH_PCRE_JIT
int rc, jit = 0;
#endif
#endif
if (error_msg == NULL) return -1;
*error_msg = NULL;
/* Compile pattern */
if(strstr(pattern,"%{") == NULL) {
#ifdef WITH_PCRE2
int options = PCRE2_DOTALL | PCRE2_DOLLAR_ENDONLY;
#else
int options = PCRE_DOTALL | PCRE_DOLLAR_ENDONLY;
#endif
regex = msc_pregcomp_ex(rule->ruleset->mp, pattern, options, &errptr, &erroffset, msc_pcre_match_limit, msc_pcre_match_limit_recursion);
if (regex == NULL) {
*error_msg = apr_psprintf(rule->ruleset->mp, "Error compiling pattern (offset %d): %s",
erroffset, errptr);
return 0;
}
#ifdef WITH_PCRE_STUDY
#ifdef WITH_PCRE_JIT
#ifdef WITH_PCRE2
rc = regex->jit_compile_rc;
#else
rc = msc_fullinfo(regex, PCRE_INFO_JIT, &jit);
#endif
if ((rc != 0) || (jit != 1)) {
*error_msg = apr_psprintf(rule->ruleset->mp,
"Rule %pp [id \"%s\"][file \"%s\"][line \"%d\"] - "
"Execution error - "
"Does not support JIT (%d)",
rule,((rule->actionset != NULL)&&((rule->actionset->id != NULL)&&
(rule->actionset->id != NOT_SET_P))) ? rule->actionset->id : "-",
rule->filename != NULL ? rule->filename : "-",
rule->line_num,rc);
}
#endif
#endif
rule->op_param_data = regex;
} else {
rule->re_precomp = 1;
rule->re_str = apr_pstrndup(rule->ruleset->mp, pattern, strlen(pattern));
rule->op_param_data = NULL;
}
return 1; /* OK */
}
/**
* \brief Execute function to validateHash
*
* \param msr ModSecurity transaction resource
* \param rule ModSecurity rule struct
* \param var ModSecurity variable struct
* \param error_msg Error message
*
* \retval 1 On success
* \retval 0 On fail
*/
static int msre_op_validateHash_execute(modsec_rec *msr, msre_rule *rule, msre_var *var, char **error_msg) {
assert(msr != NULL);
assert(rule != NULL);
assert(var != NULL);
assert(error_msg != NULL);
msc_regex_t *regex = (msc_regex_t *)rule->op_param_data;
msc_string *re_pattern = (msc_string *)apr_pcalloc(msr->mp, sizeof(msc_string));
if (!re_pattern) {
msr_log(msr, 1, "validateHash: Memory allocation error");
return -1;
}
const char *target;
const char *errptr = NULL;
int erroffset;
int options = 0;
unsigned int target_length;
char *my_error_msg = NULL;
int ovector[33];
int rc;
#ifdef WITH_PCRE_STUDY
#ifdef WITH_PCRE_JIT
int jit = 0;
#endif
#endif
*error_msg = NULL;
if (msr->txcfg->hash_enforcement == HASH_DISABLED || msr->txcfg->hash_is_enabled == HASH_DISABLED)
return 0;
if (regex == NULL) {
if(rule->re_precomp == 0) {
*error_msg = "Internal Error: regex data is null.";
return -1;
} else {
if(re_pattern == NULL) {
*error_msg = "Internal Error: regex variable data is null.";
return -1;
}
re_pattern->value = apr_pstrndup(msr->mp, rule->re_str, strlen(rule->re_str));
re_pattern->value_len = strlen(re_pattern->value);
expand_macros(msr, re_pattern, rule, msr->mp);
const char *pattern = log_escape_re(msr->mp, re_pattern->value);
if (msr->txcfg->debuglog_level >= 6) {
msr_log(msr, 6, "Escaping pattern [%s]",pattern);
}
#ifdef WITH_PCRE2
options = PCRE2_DOTALL | PCRE2_DOLLAR_ENDONLY;
#else
options = PCRE_DOTALL | PCRE_DOLLAR_ENDONLY;
#endif
regex = msc_pregcomp_ex(msr->mp, pattern, options, &errptr,
&erroffset, msc_pcre_match_limit, msc_pcre_match_limit_recursion);
if (regex == NULL) {
*error_msg = apr_psprintf(msr->mp, "Error compiling pattern (offset %d): %s",
erroffset, errptr);
return 0;
}
#ifdef WITH_PCRE_STUDY
#ifdef WITH_PCRE_JIT
if (msr->txcfg->debuglog_level >= 4) {
#ifdef WITH_PCRE2
rc = regex->jit_compile_rc;
#else
rc = msc_fullinfo(regex, PCRE_INFO_JIT, &jit);
#endif
if ((rc != 0) || (jit != 1)) {
*error_msg = apr_psprintf(msr->mp,
"Rule %pp [id \"%s\"][file \"%s\"][line \"%d\"] - "
"Execution error - "
"Does not support JIT (%d)",
rule,((rule->actionset != NULL)&&((rule->actionset->id != NULL)&&
(rule->actionset->id != NOT_SET_P))) ? rule->actionset->id : "-",
rule->filename != NULL ? rule->filename : "-",
rule->line_num,rc);
msr_log(msr, 4, "%s.", *error_msg);
}
}
#endif
#endif
}
}
/* If the given target is null run against an empty
* string. This is a behaviour consistent with previous
* releases.
*/
if (var->value == NULL) {
target = "";
target_length = 0;
} else {
target = var->value;
target_length = var->value_len;
}
/* We always use capture so that ovector can be used as working space
* and no memory has to be allocated for any backreferences.
*/
rc = msc_regexec_capture(regex, target, target_length, ovector, 30, &my_error_msg);
#ifdef WITH_PCRE2
if ((rc == PCRE2_ERROR_MATCHLIMIT) || (rc == PCRE2_ERROR_RECURSIONLIMIT)) {
#else
if ((rc == PCRE_ERROR_MATCHLIMIT) || (rc == PCRE_ERROR_RECURSIONLIMIT)) {
#endif
msc_string *s = (msc_string *)apr_pcalloc(msr->mp, sizeof(msc_string));
if (s == NULL) return -1;
s->name = apr_pstrdup(msr->mp, "MSC_PCRE_LIMITS_EXCEEDED");
if (s->name == NULL) return -1;
s->name_len = strlen(s->name);
s->value = apr_pstrdup(msr->mp, "1");
if (s->value == NULL) return -1;
s->value_len = 1;
apr_table_setn(msr->tx_vars, s->name, (void *)s);
*error_msg = apr_psprintf(msr->mp,
"Rule %pp [id \"%s\"][file \"%s\"][line \"%d\"] - "
"Execution error - "
"PCRE limits exceeded (%d): %s",
rule,((rule->actionset != NULL)&&(rule->actionset->id != NULL)) ? rule->actionset->id : "-",
rule->filename != NULL ? rule->filename : "-",
rule->line_num,rc, my_error_msg);
msr_log(msr, 3, "%s.", *error_msg);
return 0; /* No match. */
}
else if (rc < -1) {
*error_msg = apr_psprintf(msr->mp, "Regex execution failed (%d): %s",
rc, my_error_msg);
return -1;
}
#ifdef WITH_PCRE2
if (rc != PCRE2_ERROR_NOMATCH) { /* Match. */
#else
if (rc != PCRE_ERROR_NOMATCH) { /* Match. */
#endif
/* We no longer escape the pattern here as it is done when logging */
char *pattern = apr_pstrdup(msr->mp, log_escape(msr->mp, regex->pattern ? regex->pattern : "<Unknown Match>"));
char *hmac = NULL, *valid = NULL;
char *hash_link = NULL, *nlink = NULL;
if (strlen(pattern) > 252) {
*error_msg = apr_psprintf(msr->mp, "Request URI matched \"%.252s ...\" at %s.",
pattern, var->name);
} else {
*error_msg = apr_psprintf(msr->mp, "Request URI matched \"%s\" at %s.",
pattern, var->name);
}
valid = strstr(target, msr->txcfg->crypto_param_name);
if(valid == NULL) {
if (msr->txcfg->debuglog_level >= 9)
msr_log(msr, 9, "Request URI without hash parameter [%s]", target);
if (strlen(pattern) > 252) {
*error_msg = apr_psprintf(msr->mp, "Request URI matched \"%.252s ...\" at %s. No Hash parameter",
pattern, var->name);
} else {
*error_msg = apr_psprintf(msr->mp, "Request URI matched \"%s\" at %s. No Hash parameter",
pattern, var->name);
}
return 1;
} else {
if(strlen(valid) < strlen(msr->txcfg->crypto_param_name)+1)
return 1;
hmac = valid+strlen(msr->txcfg->crypto_param_name)+1;
nlink = apr_pstrmemdup(msr->mp, target, strlen(target) - strlen(valid) - 1);
msr_log(msr, 9, "Validating URI %s size %zu",nlink,strlen(nlink));
hash_link = do_hash_link(msr, (char *)nlink, HASH_ONLY);
if(strcmp(hmac, hash_link) != 0) {
if (strlen(pattern) > 252) {
*error_msg = apr_psprintf(msr->mp, "Request URI matched \"%.252s ...\" at %s. Hash parameter hash value = [%s] Requested URI hash value = [%s]",
pattern, var->name, hmac, hash_link);
} else {
*error_msg = apr_psprintf(msr->mp, "Request URI matched \"%s\" at %s. Hash parameter hash value = [%s] Requested URI hash value = [%s]",
pattern, var->name, hmac, hash_link);
}
return 1;
}
}
return 0;
}
return 0;
}
/* rx */
static int msre_op_rx_param_init(msre_rule *rule, char **error_msg) {
assert(rule != NULL);
assert(error_msg != NULL);
const char *errptr = NULL;
int erroffset;
msc_regex_t *regex;
const char *pattern = rule->op_param;
#ifdef WITH_PCRE_STUDY
#ifdef WITH_PCRE_JIT
int rc, jit = 0;
#endif
#endif
if (error_msg == NULL) return -1;
*error_msg = NULL;
/* Compile pattern */
if(strstr(pattern,"%{") == NULL) {
#ifdef WITH_PCRE2
int options = PCRE2_DOTALL | PCRE2_DOLLAR_ENDONLY;
#else
int options = PCRE_DOTALL | PCRE_DOLLAR_ENDONLY;
#endif
regex = msc_pregcomp_ex(rule->ruleset->mp, pattern, options, &errptr, &erroffset, msc_pcre_match_limit, msc_pcre_match_limit_recursion);
if (regex == NULL) {
*error_msg = apr_psprintf(rule->ruleset->mp, "Error compiling pattern (offset %d): %s",
erroffset, errptr);
return 0;
}